RetroMower 349 #26 Posted April 26, 2019 Its amazing the quality difference between a $1 drill bit and a $10 drill bit. This is something I knew all to well but the "cheap cheap" baby bird in me always gets to the front of the line first. On 4/23/2019 at 7:31 PM, bcgold said: Because these are so expensive I only purchase the one I need, solid cobalt drill bits to the rescue. I think ill buy 1 or 2 of these a month till i have a set. Went through that hardened bolt like nothing. Whew disaster averted 1 Share this post Link to post Share on other sites
RetroMower 349 #27 Posted April 27, 2019 Im honestly suprised it ran as well as it did with this much damage to the exhaust valve and piston 1 Share this post Link to post Share on other sites
