Step 5: Prepare the base
In this case the ends were marked and drilled with 4 contact points ( pictures show 3 but I added a forth which will be explained later.each and the face was marked with 6 points.
The points on teh face were 2 inches wide and 1.5 inches spaced apart.
The holes drilled were 3/16, the same diameter as the rivets.
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