I wouldn't "try" this out on a crank I wanted or valued. I'd do it (practice) on something else-
Then again- I wouldn't do this to a crank- first- I don't know what I'm doing. Second- I don't know how much tolerance the alloy has- even if all the drilling is perfect- I think the Super Custom lived at the lower end of the SR range and I don't know what that means as far as metallurgy and forging and quality. Third- I don't know if by drilling you're introducing cracks or stress risers that could fail catastrophically and suddenly.
SR made a Super Custom triple with an 86 BCD- I had one on my Trek 420. It's the same BCD as the Stronglight 99 crankset.
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*Recipient of the 2006 Time Magazine "Person Of The Year" Award*
Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.