Agree with all. You can get a new idler wheel if that's all you need, and usually that plus a good lube will do it. Fitted with a ceramic type cartridge, it's OK for casual playing. Probably can get a spindle for 45's as well, millions were made.
The BSR 500 series usually had a magnetic cartridge installed.
4-pole motors too.
These models were the higher end from BSR.
The 600 series had cast aluminum platters.