Have a Remington Mohawk 48 that has a 1/8" metal pad silver soldered onto the rear sight groove area of the receiver. This was done for a scope mount. I'd like to restore this back to where I can use this gun for shooting clays. Appearance is not all important. Planning on cold bluing it when I'm done. Can I simply reheat the area and remove the metal pad? Is there a way to remove the residual solder left behind?