Would anybody know how to get the thread going again when this got stuck over the years? We tried with quite a bit of force (including WD40), but without any luck.
image upload no compression Yes, I have had to do it. I bought new parts.
That said, WD40 is not a good penetrating lubricant. I have read a thorough study that compared several different types of penetrating lubricants (on rusted steel) and it determined CLEARLY that a 50/50 mixture of acetone and automatic transmission fluid was the best penetrating fluid you could make or buy. They provided torque and all sorts of data. It wasn't even close. So, I recommend trying that before you settle on purchasing new parts.