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PICKUPS: Fishman Full Circle Sizing FAQ
Recent News and Updates
NEW Half-size Gollihur Bass Bags are HERE!
For many years, we've fielded requests to make our great Gollihur Upright Bass Bag in 1/2 size. We've finally been able to make it happen - you can now get the same bag in a smaller size for your half size bass. Available in black only, it features all the same design, padding, heavy-duty zippers, and other great features of our long-running, top-selling bass bag. IN STOCK NOW!
$100 OFF a new Doubleshot Combo Rig (Limited Time!)
Early adopters of the Acoustic Image DOUBLESHOT COMBO rigs get $100 off if ordered before September 1, 2019. Details are on the Doubleshot page.
Please note that the Doubleshot is a brand new product; once they start shipping, stock will be limited and often pre-sold, and we are suggesting that you pre-order ASAP in order to get one as quickly as possible.

Recently Added Products
Acoustic Image DoubleShot Speaker Cabinet (and combos)
Acoustic Image DoubleShot Speaker Cabinet (and combos)
This item is made in USA! Acoustic Image never stops innovating. Building on the massive success of their tiny UpShot speaker cabinet, now we get the DoubleShot. It HAS to be the all-time smallest and lightest 2x10 cabinet (with 5" mid/high front driver!) ever made, at 11" x 12" x 12" and only 15 lbs! It's kind of unreal - a legit bass cabinet at this size... and yet, here it is.
• 600w • 4ohms • 12" side diameter, 11" wide • 15 lbs.
Pirastro Perpetual Upright Bass Strings
Pirastro Perpetual Upright Bass Strings
Pirastro's Perpetual strings, released in July of 2019, are a chromesteel/ropecore string that are designed to provide great clarity and punch for pizz playing, while offering excellent potential for arco too. With a much softer feel and flexibility when compared to similarly positioned strings, they are a new option that finds a perfect balance between the extremes.
    Extended Strings Available: Low B String Available for this string Low E String for extensions (to low C) Available for this string
Sets AND Single Strings are available (click through to order)
Bob's Rubber Endpin Cover for Kay and Engelhardt Basses
Bob's Rubber Endpin Cover for Kay and Engelhardt Basses
We've sourced the components for you, for Bob's special durable solution to replace the rubber tip on an Engelhardt or Kay bass with the 1/2" endpin.
Fishman Full Circle Pickup
Which size do I need?


The Full Circle Pickup from Fishman is offered in three different thread sizes, since not all bridges use the same sized adjuster wheels. Of the choices, the SAE ¼x20 is the most common bolt size by far. Almost all of the adjustable bridges we've ever sold at Gollihur Music are of this size (the only exception; at one time we carried a limited quantity of bridges that had threaded inserts - these were of the somewhat less common 6x1 metric persuasion).

The easiest and most fool-proof way to tell which size you need is to take out your current adjuster wheel and count how many threads there are in a ½ inch along its threaded edge (since the wheel doesn't quite have a full inch of threads). If this measurement shows that your current bridge has 10 threads per half inch (20 threads per inch), similar to the graphic at right, you need the SAE 1/4"-20 version of the Full Circle. If it has 9 threads in a half inch (18 per inch) than it's possible you have the new 5/16"-18 version. (You can double-check by measuring the end diameter of the threaded post - the new version is threaded onto a larger post, 5/16".)

If you aren't even close to 20 threads per inch, try counting threads next to a metric ruler - if the threads are spaced exactly one millimeter apart, you've got a metric-threaded bridge (and need the 6x1mm version of the Full Circle).

These printable gauges from Bolt Depot (a purveyor of hardware items) may also help you to count threads accurately.

If you are uncertain about the size, here's another tip: Go to a decent sized hardware store (e.g. Ace Hardware or True Value franchise) and visit their aisle with all the little drawers with all the different sized nuts, bolts, etc. Buy one or more nuts (usually less than 35 cents each) in the size you think is correct, remove the adjuster from your bridge, and see which size bolt fits.



Here's a photo of the adjusters side by side, for comparison.


The shorthand:
SAE ¼x20 means: ¼" post, threaded with 20 threads per inch
Metric 6x1mm means: 6mm post, threaded with 1 thread per millimeter
SAE 5/16"x18 means: 5/8" post, threaded with 18 threads per inch



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The Fine Print:

The information contained herein is based on what's in my brain — and/or my observations and opinions from my personal experiences (and those of Bob, before me) — as of this moment today, and is subject to change. I'm sure that a great deal more information and detail could be added — but the intent of these writings is to present easily understood, quick FAQs, to address common questions and improve the reader's general knowledge.

What's written here is by no means any kind of authoritative absolute answer, for I am not the world's greatest authority on bass (not even close), or on much of anything else, for that matter. So, by all means, get a second opinion, and know that all the information provided here is for general informational purposes only. I am not providing professional advice; be aware that, where applicable, any information acted upon is at your own risk.

I simply and sincerely hope the information and opinions here are helpful to you on your quest for knowledge about the bass and related subjects... that's the point!

I welcome email with dissenting and additional viewpoints/information/updates that help improve my personal awareness and these content pages. If you have a question that you think belongs here, please let me know.
Mark

PS: It should go without saying that all of the information here, unless otherwise attributed, was expressly created by us for the benefit of our customers. All graphics, text, data, and other information is copyrighted © 1995-current. You are not permitted to re-use any text, information, or graphical elements on your own website; you may post links to it, or small excerpts, on message boards if properly attributed and linked back to our pages.