19-02-2021, 01:25 PM
(This post was last modified: 19-02-2021, 01:28 PM by Stuart Giles.
Edit Reason: missing word
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David, That's interesting information about the thread of the large screw in core plug -@ 1 1/4" x 16 TPI it's the same as the rear axle hub thread. It's also happens to be identical to the now obsolete British Standard Conduit thread of that diameter-so, on a dusty shelf somewhere in an electrical supplies store, there will be some conduit blanking plugs which will screw straight into an early block 