Hi Ginge,
Build is looking good on your build thread.
They look like course threads on the grub screws, Depth of thread = 0.866 of the Pitch of the thread so 8-(0.866x1.25)=7.02mm so a 7mm drill would be fine for the M8 thread. Plus the cast of the upright taps easy.
Keep it up....AndyH
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