I have this one since 1977, it has survived three relocations but, apparently, my one year old daughter has been too much for it...
Inward motion of the tonearm on start ceased to function properly today (outward motion on shutoff is OK though) and it sounds like something got loose inside.
I have no experience disassembling these 123x units, and any advice on how to perform this safely will be appreciated -- I have got a copy of the 1237 service manual, but it's been more frightening than helpful so far.
Just removing the platter would be an achievement...