I have an old Kismet Weaver (a good make!) mechanical wheel balancer thats been sat in the corner if my workshop for a few years.
Its in good condition and works well, and even has the instuctions.
It mounts wheels using the wheel studs so of the wheel center isn't round (like mk1 wheels) it will still work.
I am looking for £150 for it, either collect from Haywards Heath or could bring to North Weald or Transitmania. https://m.youtube.com/watch?v=NVwTlY0db-I