My 212 has a rod on the frame just behind the drive pulley. The belt must run upwards of this rod. If it goes around the rod it will not get the proper slack.
This is the type of mule drive that os mentioned in the previous post from the Craigslist ad he saw. It is completely different and is used for two different model tillers... The earlier 32 inch versions.
we don't want to bring that one into the mix or folks will get real confused