best 123 blocks !! credit to robin renzetti
grabcad
best ever 123 block design. please watch youtube for a complete understanding.please view tom lipton's excellent youtubehttps://www.youtube.com/watch?v=FxVPM08jnGM i added the additional feature of tapping all the counter bores 5/16-18 for extra setup options. also notice the modified setup screws.
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