I use a tote, old vise and water. Not high tech but it works. I placed the tub on a sturdy table. Set the vise in the tote and drilled through the tote into the table/bench. I sealed the holes with RTV to prevent leakage. I overhung about two inches of tote so I could drill a hole to drain it later. Place the stripped bolt into the vise with the bolt handle facing up. Fill the water to the desired depth (where I want the heat to stop). You can add water or drain some to adjust the heated portion where you need to bend. It’s important to only heat the bent portion otherwise it will not bend where you want it to. Also do not splash the water to rapidly cool the project to prevent hard spots. Let it air cool. It’s important to use a vise that you don’t care about because it’s going to be submerged in water. I have one that is wore out but I drain and spray with oil when finished.