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I reckon I could have a bash at turning a braze on shifter boss and a sleeve nut into that.
Edit: I've just realised that the broken side must be slightly different to the remaining one, maybe not so easy to replicate...hmmm.
M_V-
You're a gent for offering, but managed to work through a solution for now.
It's a really odd design. The threaded bar has a hex in the end so you can rotate it through the shifter bosses to get the assembly tight - you can also rotate the boss separate to the curved downtube washer to nip it up. Hopefully painting pictures with words here as I didn't take many pics!
I unscrewed the sheared bit of boss, backed out some more threaded bar from the good side so it would reach the remnant of the other boss and tightened. Cable stops back on and hopefully good to go for a few more miles!
Josē
I have a 90s Moser Sprinter. Took it out the shed this morning and the cable stop and shifter boss on the right hand side had snapped off the frame!
Seems a pretty unusual setup - the stops bolt into one another through holes on either side of the downtube. Seems to be a design also used on Cannondales and a cursory search shows replacements are unavailable. Couldn't see anything on SJS either. Am I limited to using a clamp-on boss now, or does anyone know of a replacement?