You could have used a feather board type arrangement to keep the piece from coming up, without putting additional pressure on it, but I think the problem is the bit slipped in the collet. I'd check the cleanliness of your bit shank and collet, make sure that nothing is there to keep your collet from tightening properly.
You could also check the condition of your collet, I did have one on my PC router actually crack, preventing it from getting a good grip when tightened. Lastly, you could check the shank size of your bit, as some are quite a few thousands of an inch greater than/less than the size they are supposed to be.
Let us know if you find out anything,
You could also check the condition of your collet, I did have one on my PC router actually crack, preventing it from getting a good grip when tightened. Lastly, you could check the shank size of your bit, as some are quite a few thousands of an inch greater than/less than the size they are supposed to be.
Let us know if you find out anything,