Mafac Racer centre bolts

[klunkrider]

Anyone replaced the centre bolts on their Mafac Racers with something a bit longer?

I think you have to remove some material from the head of a bolt if it's not an actual Mafac one but I can do this easily enough, just wonder if there's anything else to look out for?

I think the original bolts are somewhat of a press fit into the caliper so they don't turn as you tighten the nut? Might be hard to replicate but I could build up the diameter just behind the head with some silver solder or brass and I have access to a lathe so can turn it all down to size.

 

[pigman]

Not sure what the existing ones look like, but might coach bolts work? They have a square behind the head to stop the turning

https://www.toolstation.com/coach-bolt-nut/p74444

 

[Glug]

I've got some Mafac Racer here and the mounting bolt has a key that fits into a slot on the caliper.
Only works when the bolt is fairly tight which is why I remembered.