At Carlisle there will be a man who is a rep for a company called
Duracool. (His name is Al Lambert and he had a booth at the "Spring at
Carlisle" Show.) Duracool is a manufacturer of premium hydrocarbon
refrigeration products. They're worth looking into for various reasons,
one being that the charge necessary to fill a system is never more than
40% (by weight) of the charge of the older refrigerants which they
replace.
This, combined with the info Kerry Pinkerton provided recently on the
list about the ease of ability of custom-made refrigerant hoses, seems to
be something worth considering. Hope this information helps.
Barry (the bear)
60 Crown Southampton
50 Windsor
51 NYer
(various other sundries)