Chainsaw Repair

you probably read my 338 posts.
I found a 9/16" outside diameter, approx. 1/2" inside piece of steel tubing,  1 1/2" long then drilled a 9/16" hole in bottom lower half of muffler and silver soldered the piece in with 1" inside and 1/2" out.. You then will have to cut a 1" hole in the plastic shroud to allow the "stinger pipe" to clear with the anti vibe movement. I left the factory outlet open the way it is.

Myself doing aerial arborist work on a climbing line, over the last few years I have burnt holes right through my safety pants with the pipe outlet , now worried one day  I may melt my synthetic climbing rope. So I'm buying a new muffler and will cut off the factory outlet cover and enlarge the pencil eraser sized hole to about 5/8" then solder a larger cover on , a cover that I can find from a pile of old mufflers I have.
Good luck.