Finally got around to drilling out the fork & seatstay bridge on that Miyata 610. Almost finished.
The original brakes were a pair of Dia-Compe single pivot, external nut. Didn't really want to use them. I have a pair of take-off RX100 brakes (BR-A550) laying around, but they're recessed nut.
Yeah some people say "brakes not necessary", but even on a fixed gear I like having them. Don't think I'll use this ss, but options are good.
So I got some stub length HSS drills 7mm & 8mm, and for the inside rear, the cheapest right angle drill attachment that I thought would work.
Out of the package that thing was super crunchy. Took it apart, no grease lol. So I put some on the bevel gears & needle bearings. Also it's a not-great-quality keyless chuck, and couldn't grip the smooth shank bits tight enough... until I used two pairs of vise grips. Only needed it for one hole, and it held up. Good enough.
Also drilled out 2 of 4 half-moon spacers, because they have to accept the recessed nut. The frame & fork don't have flat spots like later ones would. Used a smooth jaw vise, and I was surprised they didn't shift. That's a sizeable drill, and if you clamp too hard the spacer folds in half.
Removed the triple-box nuts from the backs of the calipers, to "recover" some bolt length. I don't anticipate any problems. The tip of the spring is captive, and there is a steel washer between it and the half moon spacer.
That's a mockup of what the mounting looks like. Still waiting on my Universal order with slightly longer recessed nuts.
I rarely use this pen-style Dremel, but this little carbide bit was just the thing for deburring these holes, esp in the fork crown.
>>1995962I'm not paranoid, but I have a rare first name. /n/ is a nice enough board, but
