This bent so quickly it was a joke, I got new grade 8 steel bolts and that help make it much stronger. Ultimately I needed to cut the bearing off with a torch, so the weakness of the puller was exposed by a tough job. Also the flare on the point of the puller doesn't match the three crank shafts I've aligned it to.... so it will flare out the threads if used with excessive force. It's cheap, you get what you pay for...
I have a 1981 Honda XL185 that had been ridden HARD! It had a shredded chain guides that left bits of metal all over the interior of the motor and had clearly been super hot.
Not surprisingly, I was worried the bearings would be welded to the crank. So, I put the crankshaft in the freezer for a couple hours. When I pulled it out I used a hand torch to heat the bearings on it. From there I just installed the bearing puller, during the install the tool already began to move the bearing.
From there, the tool worked flawlessly and got the bearings off without any damage to the crank!