With regard to the clutch slipping, I am guessing you mean at idle as the spring loses tension with age. Might have to get inventive with that fix
With regard to the muffler, you used to (up to last year) be able to get one through ga spares under part MUF757, now discontinued. Jakmax still stock under B1SB1274, round shape but fits.
Re catcher, they are a morrison chassis so an old morrison olympic catcher will fit, or even an old turner-morrison catcher.
