So, my heat risers are nice and free, the bushings seem to be fine and not rattling around in the manifold, and even the little nut and bolt to hold the counterweight to the shaft is not rusted solid, so it is removable. Problem is the bimetallic springs are crumbling. Is there a cross reference to something newer than 61 that I can get at an auto parts store to just replace the spring? Do I have to buy an entire heat riser rebuild kit (if there is such a thing)?Do I just wire it open by closing it first by hand with the counter weight and then rotating it 90 degrees?I'm sure I'm not the first to ask these questions. Any help appreciated.--"A government big enough to give you everything you want, is big enough to take away everything you have." ... Thomas JeffersonConservatives believe government action is an obstacle to our freedom. Leftists believe our freedom is an obstacle to government action.