Found a good thread on WUS - acidic comments by a certain anti-social character aside.
Note at some point "benzine", that is, petroleum ether, is written as "benzene", which is a typical mistake of English speakers.
I have two Helm watches and they are very well made. I passed on the Komodo due to it's size. (40MM is small for me.) I did ask Mark Helm if he had plans for a larger version. He has always been responsive to emails.