Caution...Update... I purchased a ratchet allen wrench and was able to break free the blade tips today and I have to say it worked much better. If I had used the ratchet wrench in the first place instead of just an all allen wrench set it would made my life a lot simpler. I also experimented with my cutting technique and was much more successful with the saw. The key was to keep the saw in the lowest gear ("A" for my John Deere) and saw much slower speed than when I was using the medium or "B" gear. That way I can keep the PTO speed high while cutting. I did not see either of these comments on the you tube reviews but it made all of the difference in the world. I cut more than 50 large cedars today, many with trunks of up to 12-inches in diameter. Our property is overrun with large cedars and is in desperate need of habitat improvement. In the end, it was probably more a case of operator error and I hope nobody has to retrieve their saw from their boats.