Hi Max,
I started a F/C 24 today and was watching to see what went on and they do travel slowly at first and then pick up speed and I believe this is where the PT fails you just can't get it to spin quite fast enough for it to fire and this is when they kick back. Never had a problem with the 460's because the blade carrier is directly on the crank and the blade carrier is much lighter than the 24 disc. I have a pile of PT bases that I can use, just have to sand them up, repair anything that needs repairing (front axle area etc) then paint 10 or so and leave them to dry. The full crank bases I have need to be found as I just stripped all the bases and stacked them all together but if you need them you are welcome to them, I need all the motors I can get for the slashers