In Reply to: Marvel-Schebler carb posted by Jim Hart on October 15, 2019 at 10:38:59:
M/S added a small brass drain plug in addition to the standard 1/8 NPT plug at some time in 1948. Some put, and I've seen 'new' kits with the petcock for a drain plug and several 'farmerized' versions. Guys booger up the 7/16 hex plug removing it and end up using something else, often not knowing it is a pipe plug, not a UN thread.
RESTORED/REBUILT M/S TSX-241B CARB: