I just wanted to share an exceedingly clever (for me anyways) idea that worked for me when I was installing a strapjack for an LR Baggs i-mix system.
I started by drilling the half inch hole for the strapjack. Then I found that my end block was too thick so the strapjack threads did not come out of the bottom of the guitar when I tried it in place.
My solution was to join two drill bits (a half inch and a three quarter inch) together as shown in the picture below:
The drill bits already had a small hole in their heads and a number six bolt and nut worked nicely. With this bit arrangement I was able to countersink the half inch hole in the end block from the inside to a three quarter inch depth by feeding the shank of the half inch bit through the hole from the inside of the guitar, mounting it in the drill chuck and running the drill in reverse while pulling backwards on the drill. The half in bit kept things centered and the three quarter bit did the countersinking.
When I was done, it all looked planned and the countersink came out very clean. In fact, the countersinking cleaned up the little bit of the exit tear out that I had with only the original half inch hole.
I hope this was clear and is of some use to others at some point.
Pat
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