Originally Posted by
Lawrie Amatruda
As far as I know most antique, ball, butt , barrel reservoir guns and air canes have the exhaust valves in the reservoirs, these are compressed air guns, which are pre Giffard guns and are easily converted to Co2 use by using a modern valve material, as I have done with all the ones I own, the part that should not be there shown in Aimless's picture is the part that seems to be entwined in the middle of the exhaust valve spring, which looks like it has been put there to support a broken exhaust valve spring, as mentioned by Mr Fletcher they are very simple valve mechanisms, and when resealed will last many years of use before requiring a reseal if at all, I use 95 shore hardness polyurethane in all of the ones I own.
Regards, Lawrie.