I have this nice Lucas sidecar lamp suitable for my Norton Big 4, but it is quite well dented and has a crack around the top.
I was watching "The Repair Shop" on the BBC and the brass musical instrument restorer used an appropriate sized steel ball with a very strong magnet to remove some dents, I'm wondering if this may be an option with this lamp, I guess I may mave to anneal it first and this heat may result in the lower stem becoming unsoldered?
A couple of years ago I had to repair a brass headlight rim for my WD/C. I had found the rim in Beaulieu, very cheap, but it had been in a crash or something, it was badly damaged. Well, I've only used a purpose made small dolly and a light bodywork hammer to take all the dents out. No annealing needed, and I was very pleased with the result.
It might be worth annealing the lamp body before commencing work to soften the brass and to lessen the chances of it splitting...There's info on the internet.....Ian