Hi @stereo068
Here are the [https://encompass.com/item/4416575/JVC/LP20617-008A/|drum sub assembly] and the [https://encompass.com/item/4415985/JVC/LP20030-015A/|upper drum assembly] (supplier example only) for the recorder.
The part numbers are JVC LP20617-008A and LP20030-015A respectively.
Here's the [https://www.manualslib.com/manual/1260897/Jvc-Hr-S2110t.html#manual|service manual] for the recorder. The chassis and mechanical parts list is on p.26-27.
Search online using the part number only to maybe find other suppliers. i didn't look too hard ;-) As you said there's not much out there but maybe you can find either a used S7800U/U(C), HR-S2110T or S6700KR recorder at a reasonable price and use that as a parts donor.