Ron, doesn't it appear also that the slot slants downward to the front? This would allow for an insert to provide for some elevation adjustment as well... The insert could have been held in place by a small setscrew... kind of a novel modification IMHO...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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