CGW - way to go! I was reassembling my P01 and went to put in the retaining disk after installing the sear cage, and wow - the one rom CZ seemed thick - so fortunately I had my trusty CGW version - which is nicer, smoother, and thinner handy and voila -the gun is back together - who knows if I ever would have gotten it reassembled without this CGW part.
Get one if you EVER want to mess with a P01.