Exhaust Securing Springs wear/repair.
A problem with all aircraft engines that use springs for silencer/muffler retention. Easy solution, fill the springs with some RTV Silicone ‘rubber’ and the problem virtually went away. This dampens the vibrations quite a bit and stops a lot of the wear on both springs, mounting points & springs breaking. After the silicone was applied they never broke.
Where the 3 silencer retaining springs hook on and it’s already wearing deep grooves through the lugs at the exhaust connection. To avoid removing for weld repair, change the attachment of the springs. Put a bolt through the hole in which the springs normally are & hook the spring to the bolt with a stiff nut to keep it there. That way the spring is pulling on a round piece and not on a sharp edge.
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