I decided to send my Denon 103R to him for modification. He removed the body, mounted it on a stainless steel plate and added an aluminum cantilever and line contact stylus. It sounds nearly as good as the REF (at 4-5 times the price). I had an accident, bent the cantilever; he fixed it and had it back to me in a week! He has my Benz now, and I am looking forward to what he can do with it. Highly recommended!
I bet every retipper can upgrade a cartridge designed in the '60 like DL103 (aluminum cantilever, conical tip), but i doubt every re-tipper can upgrade Benz or some other advanced cartridges of today.
You said your Benz has not returned yet, but you already recommend this vendor, strange.