Mowing ..

[DFB FGXR6]

Originally Posted by Citroënbender

You can re-use a crush seal on a spark plug a few times, I think it’s NGK who have guidance on their site for the difference in how you torque it down.

The person making these comments was a builder of modified high-performance chainsaws, where tight tolerances would be more critical. I don't know how practical it would be for most people though.