Campag C Record Triple?

[Nob]

 

[bikeworkshop]

You could probably make one like the NR by drilling and tapping the arms and adding spacers for the smaller inner chain ring. I believe when people first did this to the NR it was just done by people that knew a machinist and had them do it. I'm pretty sure it would be fine as there's more meat to the arms than a NR crankset. I bet it would look sweet.

The more modern shape might not be very flat, which could present complex requirements for the tapping and spacers.

I mounted a 110 ring straight off a 130 ring in order to make my starfish compact;

Now featuring matched cages
It suddenly struck me that as a retailer, I could avail myself of a staff purchase price of a Supacaz bottle cage- because unlike 99.9% of the bike stuff i order, its actually for me!View attachment 855290
The outer ring was a narrow bmx item sold with drilling for 130 and 110.View attachment 855438

The mavic chainset had a spacer holding off the inner ring with the chainring bolts threaded into a blind socket in the back of the arm.

I used these spacers to hold a 34 tooth ring off the 110 holes, with single chainring bolts flush holding the outer onto the spider
View attachment 855295View attachment 855296
One day I will polish the outer ring.
Shifting is pretty good with the ergos, although the f.mech clacks on the crank arm if you don't trim after a change onto the outer.

This would be possible if you found a (stronglight?) 94pcd 42t, there should be enough material to drill the 135 (?) Pcd holes to mount onto the record chainset, then mount a 32 onto the 94 holes.

 

[hamster]

Also 'tripleiser' rings were available, a middle ring with extra long tabs which carried the inner and saved drilling the crank arms.

TA certainly did them in 135mm PCD (and 130 if you like the fishing tackle stuff ), not sure about 144mm.

 

[Nothin-fancy]

The more modern shape might not be very flat, which could present complex requirements for the tapping and spacers.

I would just counter sink the tapped hole and use longer spacers. It shouldn't be that hard to make a spacer sized hole 2mm deep with a flat bottom and with the tapped hole in the center. All though it might be better to make a conical hole for the spacer to sit in so you don't introduce stress risers at the edges of the holes. That would be my work around if I had the tools to machine it myself. I imagine it might be pretty expensive to have someone else do it for you.