Jackie reminded me of the K-Tel Record Selector. It may have worked well with K-Tel records that were wafer thin and as light as possibly could be, but if you had some heavier records in your K-Tel Record Selector, disaster followed the selection process.
Our K-Tel Record Selector sat on the H. G. Palmer stereogram. I think H. G. Palmer was a rip off hire purchase company, and the unit was re-branded, and I doubt my parents bought anything on hire purchase, so it must have been second hand. The K-Tel Record Selector had in it a mix of records, some heavier than others and it never worked as it does in this ad. The worst thing was that if you did get it to reach the end, it would tip over and dump all the records from atop the H. G. Palmer onto the floor. I can't tell you how many times Mother's lust object, Gene Pitney hit the floor, along with my Mary Poppins soundtrack.
Think of it as the iPod of the sixties, but with bugs. I don't believe there was ever a patch for it, let alone an upgrade, beta or otherwise.