Chainsaw Repair

True air conditioning grade silver solder is very expensive .A lot more expensive than soft brass(easyflow ).

FWIW any hard soldering which is what brazing is is stronger  if you can use lap joints instead of butt joints .

On this kind of stuff I'm old school and in spite of the cost prefer actylene to MAPP or propane .As far as welding I'm basically self taught but at one time I held state certifications on both structural steel and pressure piping .

The gas welding I was taught by one of the best ,my father .The old boy even at 80 could  preform magic with a torch .

A couple years a couple of California clowns made some bold statement I didn't know how to gas weld so I put a picture on of a vertical up on a tin can . That's the last I heard on that subject .