Strap lock thread size

Mac22

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Afternoon folks
I’m just in the process of replacing the strap locks on my 1993 thumb but I’ve hit a snag!
Someone has replaced the bolt? that thread into the insert with a self-tapping screw so now I need to resource 2 small bolts that I can fit correctly.
Does anyone know what size and thread pitch these could be please?
 
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Do you have any pictures to describe your problem?
I'm not sure which strap locks you have, are they Dunlops?
 

Mac22

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I’ll put some up asap 👍
 

Mac22

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Okay please ignore my initial post. There is no thread in the strap lock hole just a nice black plastic insert to make the hole look pretty. I’ll use the correct spectacles next time 🤐
 
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