Electra; clutch centre spring retaining studs

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The threads on the three studs on my clutch are slightly mangled. The studs are 1/4 x 26 tpi. They are either cycle thread or BSF, ie very similar but the question is which thread ?

I am going to run a die over the threads to tidy them up, but want to ensure i recut as the correct thread form rather than one which is nearly right.

Can anyone advise what is the correct thread here ?

Threads

I think they are 1/4 BSF. Unlike yours, these threads were in good condition in the clutch I used, a 1/4 BSF nut ran nicely along the thread.

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I THINK

I think also, I find the 1/4BSF die runs these threads (after cleaning!) with just hand pressure on the die. As it happens these are the same thread, studs, funny nuts on the AMC/Dommie clutch.