Give this man a cigar, Over torqued. I never Had a problem with using an impact driver to install blades until that. I just laughed when I pulled the blade for sharpening and it ( the adapter ) fell apart, at that point realized I hadn't turned down the setting on the gun the last time I pulled the blade for sharpening and installed it for the self propelled mower. Ya know it was only like $5.00 for a new adapter but how stupid. :ashamed: Next time I'll use the air ratchet instead of the gun.