After reading about the Cox venturi modification for the Wasp .061 I ordered two complete venturis from EX for $12.95 each. They came quickly and look really nice. These are the units that use what looks like old style brass needle valves from Cox RTF models. His web site says they are a current production item. It's at least a starting place for the several Wasp engines I have and the stack of 1/2A stunt projects awaiting for me! I have ordered from Cox International also with no problems.
Type at you later,
Dan McEntee