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I bought the cranks years ago, it was a total fluke that they are double fluted and with the chamfered top edge. A superb set of cranks thats for sure.
I have used them on various bikes over the years and the chainring has been separated many times.
Johnny dennis's bike is the first frame i have had, that the cranks have suited so i will definitely persevere until they are right.
This time i will use locktight. Im confident that will hold them. Hopefully see you with the bike on Saturday if the bolt i have ordered arrives on time.
falconvitesse
Did you fit this chainring to the crank?
I ask because it seems to me that once something has remained bolted together for many years, the chances of it undoing itself are remote. When anything has recently been assembled, even though you've done your best to get it right, this sort of problem can happen. The only solution I can suggest is to keep checking anything newly assembled - if after a few hundred miles of riding and checking everything is still tight, you can be pretty sure it will stay that way for ever.
I expect you know this, but your excellent BSA cranks would take a TA ring (slight fettling needed) TA bolts are probably easier to come by than the BSA 'pins' which have been lost. I'd guess Johnny Dennis himself would have favoured this solution!