Geez. You've been away.
"...standard metric hardware store thread..." No such thing as that. You have or have access to a metric screw thread gauge tool? Readily available in Home Depot anyway.
And I think it's worse than it appears. I think those screws are specific to the Vz and are probably some daft metric thread that isn't available now. Gunparts doesn't even list the rifle. It was only made for 3 years 65 years ago. Dunno if the mou8nt is the same as the one used on Mosin Nagants or not.
There's a decent picture of the mount here.
1954 Vz54 sniper rifle (7.62x54r)
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