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Installing the Full Circle

Discussion in 'Amps, Mics & Pickups [DB]' started by ethnotime, Jan 14, 2013.

  1. ethnotime


    Sep 24, 2006
    Northampton, MA
    After fretting about which size of the full circle I should get, I finally decided that it had to be 1/4-20". Then after weeks of fretting about installing it without the soundpost falling, I finally get to the job and low and behold: I did indeed buy the right size but now the blunt end won't fit!!!! At least the soundpost didn't fall!

    It's a really nice bridge actually and my luthier put in threads on the feet of the bridge so I have no choice but threads down but unfortunately the non-threaded side won't fit! Anybody have any tips on what I can do to widen the hole? Is this a common issue? I'm sorry if this has been brought up in the past but I did a search and not much came up.

    Thanks in advance
  2. I use reamers here to open a hole up, but if you are careful a drill bit [ hopefully brad-point ] will also work. You do need to keep it square or you will be refitting the the feet a bit. Also a handle for what ever tool you use is helpful.... a drill press and just lining things up and not using the power but turning by hand has helped me w. this very problem before.
  3. Greg Clinkingbeard

    Greg Clinkingbeard Commercial User

    Apr 4, 2005
    Kansas City area
    Black Dog Bass Works
    There is a risk of splitting the bridge if the bit grabs and bites in too fast. The hole can be reamed by reversing a portable drill. Probably not the best way but there's little risk of ruining the bridge.
  4. robobass


    Aug 1, 2005
    Cologne, Germany
    Private Inventor - Bass Capos
    If you can get use of a vise and floor drill press, you can do this accurately. First lock the drill chuck in the down position, find a piece of blank shaft which fits snug in the hole, chuck in the protruding part of the shaft with the bridge sticking down off of it, then carefully position the bridge and lock it into the vise using shims so that the shaft can move smoothly in and out of the bridge leg. Remove the shaft and replace it with the proper size drill bit (1/4"?), and drill out the hole. Otherwise, this would be quick work for a machinist with a horizontal mill.

    Edit. If you have a machinist buddy, he could quickly turn down the diameter of the non-threaded side of the pickup, but this might be a bit risky.
  5. ethnotime


    Sep 24, 2006
    Northampton, MA
    Thanks for the replies. I have a small screwdriver bit that worked but it's not long enough. I'll look for a reamer, seems to be the safest item to use.
  6. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

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