Yeah with the 207 mechs for those went out of stock like 7 or 8 years back. The 206 is a better machine anyway.

Well CDM4 Pro's is all cast alloy, I think they were the CDM4/36. Thats a tough one to find. Most of the differences are in the actual mounting/block of the drives. The main differences between stock and pro are pro's sometimes had a hall effect motor added, glass lens instead of plastic, and they used the alloy frames. The CDM4/36 is very hard to find and the only chances if Meridian haven't got any you could buy as a spare is to buy a normal CDM4/19 and remove the swing arm and insert it in to the CDM4/36. Electrically the lasers are same and apparently it works like a charm.