Well I definetly couldnt do it as I am not very good with this things, but a friend could maybe do it, depending on what needs to be done I found a piece in the EU and the cheapest I foundis like 35 EUR with shipping, where I could get a complete 1 piece metal chamber for like 15 EUR shipped...
Well, it works now as a friend moved it in place and tightened 1 screw more then the other, but who knows when its gonna get bad again.
I found one in the EU, but it is very expensive. What do you mean another mounting plate missing tho?