I have a four row water to air coil in my furnace plenum. The coil was built with 1-1/4" male adapters brazed on to the header. I cant get these adapters to quit leaking. After the first installation with tephlon tape and Gasolia Pipe dope they were dripping. I took them apart and did 10 wraps of tape and then used Permatex pipe dope, and they are leaking more then before. I noticed that when I thread the female adapter onto the male adapter on the coil I can thread it on all the way until it bottoms out ,all by hand. Can brazing be unbrazed with enough heat and then apply new male adapters? If I take a sawzall I could cut off the adapters and still have about 3/4" of pipe to work with before the header. Is that a better option?