I picked up an used Kadet II at a price that I thought was reasonable. Long story short, I sold my first Kadet II a few years ago, a decision that I came to regret later.
It took about 5-10 minutes of filing to fit the Kadet to the 75B. Today I gave it a light cleaning and took it to the range.
Setup-
Kadet II
CZ 75B frame (converted to SA)
15# hammer spring
CCI Minimags
Modified speed loader (Took about 30 minutes to file down the metal guide?)
It shot 100 flawless rounds. The groupings weren't great, but blame the shooter
It was really a pleasure to shoot, and it's going to be one of the regulars in the range bag.