Reply by pintodeluxe

The first time I changed my blades, I could tell they were torqued on there pretty good. However on subsequent changes, I have had no problems. I blow the dust out of the bolt heads, which lets me seat the allen wrench all the way into the bolt.
Thanks for the heads-up on the lock washers.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush