Single chainring bolts for Campagnolo Carbon Compact cranks

[chriscross1966]

Hi folks, wondering if this is a solved problem somewhere, but haven't been able to trace an answer so far...
Basically the issue is I have several Campy carbon compact cranks I want to use for various projects, the issue is I generally only need single front chainrings rather than doubles....

The Campy carbon compacts I have are all hidden bolt designs and they all have slightly smaller bolt holes than regular chainring screws. I couple of places on line do sets that suit double rings but I've never found anywhere that did sets for singles...

I could (I guess) just put a washer in there as a spacer, or even fit an inner ring I never intend to use. In the past I have machined up parts to fit that replace the inner screw but was hoping to avoid a bunch of faffing around with the lathe...

So does anyone know of anywhere that makes a set of screws that will fit these cranks that is the right length for single rings?

 

[si_c]

You can either buy chainring shims or narrow bolts.

 

[chriscross1966]

The shims might work, the bolts won't, they're standard M8 sized and Campy Carbon Compact is smaller than that. Will probably make up a shorter bolt for the hidden bolt and fit the shims, will need to measure the heads to ensure compatibility.... might just use a chainring spacer on the rear bolt... guess it depends d's on clearance.