I'll second Youxin Ye for LTM Leicas. I sent my IIIc to him and he replaced the shutter curtains and cleaned the Summitar and the outfit is smooth as butter. About a week turn around time and I didn't feel like I had been robbed.
I sent an M2 to him also, I may have been better off sending it to DAG or Golden Touch. I have not used DAG, but I have had Golden touch cla some lens and I can recommend them.