Sounds like the splines . sorry I have no idea what you do next. GoMog has a few items on it.
https://www.gomog.com/allmorgan/wirewheelbalancing.html
https://www.gomog.com/allmorgan/wheelsindex.htm


MWS maybe can help. I used them in the past & they were very helpful.
http://www.mwsint.com/site/cms/contentChapterView.asp?chapter=6


JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"