Newton writes: <<I use the vise grips and a reversible drill to remove the blocks using a backcheck tool.>> Greetings, Hmm, if the blocks are to be replaced, I just cut them in half,(lengthwise) with a pair of large endcutting wire cutters, they usually crack right through the hole and fall off. This is less stressful on the wire/key than unscrewing them. I will also mention that I usually recover the backchecks, I don't remember the last time I had to replace. Regards, Ed
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