1956 T Bird-The old balancer had serious groves, so I got a new old stock part. There is a ridge in the bore of both the old and new part. In trying to install the new part we "bottom out" in less than an inch. We just get in to where the key restricts the turning of the damper. When the damper stops, it sounds like we bottom out on solid steel?! We tried without the key to no avail. Any thoughts or suggestions would be greatly appreciated! Thanks in advance.