I have a lawn tractor that has a 3/8" square drain plug (it is a little bigger than 3/8 I cannot put a 3/8 ext bar on it). It is a very tight spot to get a wrench on it. Now I take a 1/2" ext bar and put a wrench on the drive end to turn the plug. The 1/2 is a little "sloppy". Any ideas?