Got a 35 year old Gerbet bathroom faucet in need to replacement. Been fight all day trying to break the locknet loose and this is with three different basic wrenches. Even soaked the offending locknuts with both kroil and PB Blaster the night before. Anyone know the correct sized deepwall socket I should purchase?...I have a partial set of deep wall sockets but nothing close to what I think I need. Hate to purchase a set of standard deep wall sockets only to find I then need metric sizes.