thinking installing K&K pickup

[eyesore]

I recently purchased a brand new Huss and Dalton Crossroads acoustic. The end pin is a little smaller than normal for the quarter inch jack , I need to make it a little bigger , Any suggestions for tapping the hole out without screwing this up? Thanks.

[Shuksan]

The best tool out there for this is the end pin reamer from StewMac. It's pricey, but it works perfectly. https://www.stewmac.com/luthier-tool...ck-reamer.html

Many people use step drill bits which can be had for a lot less money.

The K&K install instructions say to make the hole 1/2" in diameter, but it's better to make slightly smaller at 15/32" or 12 mm for a non-sloppy fit.

If you haven't already, you should check how thick the tail block is to determine if you need to relieve any thickness on the inside of the block for the jack to fit lengthwise.

There's a really good thread on installing end pin jacks here that's very much worth a read: http://luthiersforum.com/forum/viewt...hilit=forstner

[eyesore]

thank you sir!

[IndianHillMike]

If you already have a good 1/2" brad point bit, another option could be to just plug it with a dowel and re-drill. Make sure you go slowly in reverse when you first start to drill -- scoring/cutting through the finish this way should hopefully prevent any chipping.

[charles Tauber]

If there is already a hole there, the easiest way to make the existing hole bigger is to drill the hole with the next-size-up drill bit. Repeat with progressively larger bits until you get to, or just below, the size you want. Done this way, there is little chance of harm. It's nice to sneak-up on the size with a reamer, if you have one, but it isn't essential.