If you have an account with Shimano your rep should be able to provide the latest manual or at least the pages you need. For some reason Shimano has become stingy with this info.
I haven’t used a jig for the front derailleur hanger braze-on. I just use a homemade braze on clamp to hold it to the seat tube, and I do a bunch of measuring to make sure it’s in the right place.
Richard Sachs’ hangers have a little locating pin that seems pretty awesome, and would make it easier to ensure things are in the right place when brazing, but I haven’t used one of them.
See link below. The first six or so images. For a 52 or 53 outer make the location hole 121mm up from the shelf of the bb exterior, and on the geographic r.h. centerline of the seat tube.
Interesting. I think you could still do this without a jig. Here’s what I’m thinking:
If your derailleur hanger doesn’t fit flush to the seat tube, a jig can hold it in the right place, but then you’ll have a big gap to fill between the tube and the braze-on, right? This could be done with bronze or a fillet-building silver, but I think the result would look… weird.
It’s much better if your hanger does fit really well to the seat tube, so maybe you need to file out the mating surface so that it accomodates the angle of a squeezed seat tube, but it should still be perfectly flush against the tube. This would allow you to fill the joint with a flowing silver solder (I use Harris 56).
If this is the case, I think you could get away with a simple clamp, or even something like a file balanced on a brick .
i modified the hanger the last times so they fit flush. I Want the jig to check how flush and first reason how straight the hanger fits. To do the right filing
Oh yeah, that makes good sense. I’m sorry I don’t have a recommendation for you.
You say the jigs you’ve seen online look super weird? I haven’t looked that closely, but Alex Meade makes one (here: https://alexmeadetools.com/?product=front-derailleur-mount-jig). Is this one of the jigs that looks weird?
I haven’t seen it in person, but I do have quite a few of Alex’s other tools, and they’re all pretty great.
I thought about a jig wich use the reference of the BB surface and hold the derailleur in place. Not press it. I also have the problem with the ovalisation. so i can’t use the 28.6 plate to get the derailleur in place.
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