A question for the scope repair people

[Rumpelhardt]

I have an old J.C. Higgins 2.5x scope that works fine and has good clear optics but the reticule came undone. I changed it from a fine cross hairs to a post and cross wire but I could not re solder them so I epoxied them in place. They seem to be well attached but I am wondering how it will hold up. If they let go again I want to solder them so my question is what is the best tool to use? The piece that the cross hairs attach to is brass soldered together so I need to keep the heat localised. My soldering iron just leaves a gob on top that does not stick to the brass so I'm guessing that I'm trying to use ether the wrong tool or the wrong type solder or both.
Thanks for your time.

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