[GB SISSON]

Gotta say the stainless route is a great way to go as well. Some of you know I have done a lot of work with old toyota landcruisers. They have a problematic flapper/heat riser in the exhaust manifold. Mine always leaked and hissed from the pivot and I hate manifold leaks. I pulled mine out and to do so had to remove two #2 phillips screws that held the flap. I simply unscrewed them like thgey were installked them the day before. Then I put a steel bolt straight through the manifold with gaskets at each end and no flapper. It lasted less than a year. When it failed it was about as thick as a human hair in the center, then broke in half. I went up to my attic hoard and found the stainless shaft I had pulled and it was like new. I installed a stainless bolt this time and it is still in there 35 years later. Stainless does really well in the hot zone.