[Mart]

I used to use a oxy acetylene flame but very gentle. I recently used a very simple el cheapo blowtorch. Nothing fancy.

My technique is to be ready to flick the flame away the moment I feel it is getting too hot. Flick it away.. Bring it back..Flick it away.. etc.

Like most things I am self taught so I may be doing it different to others. Maybe completely wrong, but I normally manage to make the repair.

Mart.