TALKED TO Ed Carlson again. He has a CS 061 diesel c/l version he thinks the quality may have improved and has the R/C carb version coming in about a month (this is the company that makes the Brodak 049 they machine the contra with the allen compression screw as one piece
thus the whole thing turns when adjustiing and hear it is really tight my guess no vitron O ring, he thinks metallurgy may be better and they went CNC,they have had past issues. If they can get this right it would be a much needed 1/2A engine, the one piece thing most likely is to prevent the drop of the contra.if really tight the head will strip . The good news is looks like the MP jet 061 diesel will come back a few months down the road but will be bucks. After the AP wasp 061 issues I feel very cautious on this one martin
if the same size screw in head as cox the Davis head would be a solution