Hi all, this my first post to these boards, I hope some one can help me with soldering mobile decoaders to the brush caps of the non-DCC can motors that come with the Bachmann DC F units. I'm pretty decent with my Weller soldering iron. I use low heat, a fine tip, good thin solder, and tin all my leads. Still I'm burning/melting these motors at an unsustainable rate. I this point I feel it's got to be a technique thing that I am missing.  Please help keep my railroad solvent by sharing any techniques I seem to be lacking. If this keeps up I'll be able to run the first dummy unit train MRR history! Thanks