Re: Frozen bobbins
Posted: Wed Nov 04, 2020 11:23 pm
Back to the original question of how to remove the original siezed bolts. A good soaking with penetrating fluid repeated over a period of days, combined with heating as you suggest with a large soldering iron may eventually loosen the bolts. It did for some of mine, but by the time I had actually fully unscrewed some of the bolts the thread remaining in the bobbin was so corroded away that it was useless for securing anything. I went for a mix of drilling them out and using a nut and bolt, tapping them oversize or replacing the bobbin completely depending on condition and function. As for using stainless bolts, they are not as strong as high tensile steel bolts and can cause galvanic corrosion. That said I have used them in certain places such as along the bottom of the sills as I have stainless steel sill members. In interior applications where the bolts are going to be dry and hence there is no electrolyte the stainless probably will give no problem.