Originally Posted by
FBinNY
You need more leverage than you'll ever get with pump pliers or a wrench.
Instead, clamp the tool (BB cup remover) onto the bike with a long bolt, or using the crank spindle and something on the other side.
Once it's secure, place the tool in a vise and use the frame as the wrench. FYI, it's important that thd tool I'd bolted securely to the frame because there's a tendency to not keep everything square, and you'll tear the cup an/or the tool apart.
You'll also help yourself by soaking the area in penetrating oil for a day or two before trying.
One last note - - - make sure you're turning in the right direction. In some countries both sides have right hand threads, however ISO threading has the right side (chain side) using a LEFT HAND THREAD, so it's possible you've been killing yourself trying to tighten, rather than loosen it.
Your getting the best advice there is defo change the pliers and if its a alliminunm frame use a heat gun NOT a flame thrower a good heat gun and keep it on one spot then change to about 3places as that metal spreads the heat u want it to stay at the bracket ✌️youll get it tho u might strip out ive faith tho p s ive a vice going sideways down a bench for such work helps so much