[Squire]

You might try cleaning the cartridge contacts. Those tilt cartridges aren't wired in, they just snap into the tone arm head. BTW I don't think working ones are found very often. I wonder if you have the ceramic version instead of the crystal? If you take it out to clean the contacts, let us know what the cartridge number is. I've heard those changers (M-22?) can be hard to rebuild but it sounds like it was no sweat for you! Nice job!