I'm reassembling my motor/trans and can't get the torque converter cover to seat. The TC slid on easily and seems to be very close to the case ribs on the inside, but the cover is still held a 1/4 inch away from its mounting surface. I tried tapping the TC on further with a large socket, but it doesn't seem to move. I'm trying hard not to damage anything with force at this late stage in the long rebuild. Any advice?