The following is a continuation of a conversation on another forum in regards to an L42A1 that has a #3 bolt head fitted.

The question is, when the L42s were converted, did they get new #0 bolt heads or were the bolt head that was on the No4T just get proofed to 19T?

I have read much about the proofing, but little else. As the accounts of the No4Ts being 'long in the tooth', I reckon it is plausible that a No4T could have come to the work bench with a #3 bolt head prior to conversion.

Thanks in advance for any input on this mystery and happy new year to all.
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