I currently own four classic 70s amplifiers with two in active use. On occasion I like to swap them within a few minutes. Now, the binding posts of some are challenging. The sansui au505's were among those ones (spring clip terminals) and the au101 just sports regular small screws.
It started with the au505, that I needed pin connectors. I only owned cables with banana plugs, and did not want to get or make different sets. So I created some solid paperclip extensions by warping them around the plug and it works really well. Then i created some for all my ancient amps and I think they fit in any system ever made.
Pro-tinker tip: never inform a passionate audiophile about it.