Especially those cheap Chinese ones that I use. I just had the stripped threads enlarged and a new stronger forcing installed. Of course I did buy a new puller set as I need the smaller forcing screw to pull on 3/4 crankshafts. I snapped the puller arms on a 5 ton three arm puller back in the Summer but I haven't replaced it yet. I having to look at the new ones in person as the replacements from Harbor Freight all had the forcing angle off center so they would puller sideways which just jams things worse.
Normally on the bigger puller I throw the impact at them without problems so I was surprised when I stripped the forcing just using hand tools. I didn't know I was so strong.
I must have eaten my spinach that morning.
