While I'm waiting for the parts for the Jazzmaster to arrive, I found some other trouble to get into.
You may recall my previous attempt at a fret wire bender. It worked ok, but I wasn't happy with the alignment of the rollers, and the crank didn't fit the main roller shaft well at all.
So I decided to make the Crawfish Fret Bender Mk II.
I followed the plans from LMI much closer this time, starting with a 1/4 inch thick aluminum plate. Cut it into a 4.5 x 4.5 inch square.
I also sanded all the edges so they weren't sharp.
I got the exact patio door rollers and crank the plans called for. Turns out the rollers I had were exactly the same. Whatever.
I know Sven of Argapa has (I think) a Proxxon tool - probably better than the Dremel. The Dremel is ok, but most of the attachments last for one use and that's it.
You can pretty much emulate this easily. The top hole is 5/16, and the right hole and slot are 1/4 inch. The center hole for the top is about 1/2 an inch down. I think the two outside holes are 1 5/16 in from the edge.
The measurements probably aren't too critical - if you have the hardware you can lay it out and eyeball it. Or you can buy the plans! (What a concept).
On the other side, put on a washer, a lock washer and a nut.
Hopefully this helps to visualize how it works. You tighten down the nut, but the roller can spin on the shaft of the bolt.
The top roller is a sandwich (mmmm...) of two 1 1/2 inch round 5/16 washers around a 1 1/4 washer. A 5/16 bolt goes though this 'pulley.' Put a thin (the key is THIN) nut on the bolt and snug the pulley up.
Then slip it through the hole and put a window crank on the other side. This is another key bit - the crank should have a fairly tight fit on the bolt. My first version had a lot of slop and the crank wouldn't stay on!
Feed the fret wire in from the left and crank it through. The slot lets you adjust for the radius you want. If you need flat for an ukulele or classical guitar, the slot will need to have a good bit of adjustment (I'm going to extend mine more).
Good luck to me.