I just bought an early 1960s PAL adjustable injector with original case. The razor and case look nearly new, but I can't replace the old blade in the razor using a modern Schick injector blade key. The key inserts with some effort into the PAL, but I then can't get a new blade to move into the PAL and push out the old blade. The Schick key works fine in my two 1940s Schick G's and my newly acquired Parker injector, but no luck with the PAL. I even tried dialing down the adjustment dial to "1." The key still won't load a new blade. Any suggestions from the Badger & Blade sages would be much appreciated.