I think I know the answer, but maybe not. I just bought my second heavy 10, the first is 1944 with threaded nose spindle. I use the threaded nose protector to remove the 5c collet adapter. On my new 1964 heavy 10, it has a d1-4 spindle nose and a hand lever collet closer [which I have never used before}. it looks like the only way to remove collet adapter is by using a knockout rod after removing collet closer?? Am I right, or is there something I'm missing. there is a spindle nose protector, but it doesn't interact with the collet adapter. Thanks for input.