I had a conversation with someone else about whether or not the LX200 used the same handset as the LXD 750, and based on that converstion, the answer was no.
I know that the "pier" setting issue is already solved, but it occurs to me that this is an opportunity to explain the handbox deal in case anyone else has questions about that. There were a few different handbox revs for the LX200 in the earliest model years. The last one issued was rev 3.21, in 1994 or so. This is NOT the firmware rev in the mount; it's a hardware handbox version that's compatible with the latest mount firmware released. It is this latest handbox version (3.21) that is used with the LXD650/750 mounts, and it is interchangeable for use with later LX200 (1994-2002) models. The feature differences between LX200 models and LXD650/750 models are due to firmware in the mounts.