Sigma 4/3 mount replacement

If you are asking if a m4/3 mount can be adapted to 4/3, the answer is that it cannot. You can only go the other way, adapt a 4/3 to m4/3.
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Bob B
http://www.pbase.com/bbernstein

Olympus e30, e-510, 12~60, 50~200 ED, EC14, 18~180, 14~42, 40~150, 50mm macro, 9~18, fl36