I purchased the Muscle Chuck in February and have had recurring problems especially with the use of the 1/4 inch collet. Today marks the 4th time I have had a down cut tool screw itself into a piece of wood. I have checked tool diameters and made sure that the collet is inserted correctly, but the problem returns. I am not making aggressive cuts or using high feeds and plunge rates. This has happened in medium and soft woods. One of the instances was with a 1/16 inch up cut tool making a 1/16 inch deep pass.
I am putting the chuck and the collets in my tool box and going back to changing out the collets on the router. I can't afford the time or the material.