As can be seen this Smiths has some major improvements over some I have shown, including a strengthend turret, an in box lateral adjuster (for centering the door), strengthend claws and the two part lid that incorporates the bronze collar.
The Smiths had some wear that needed to be taken care of and was missing it springs when it was first presented to me.
The wear was taken care of by manufacturing a collar and a new wheel for the pin, that I had hardened and the bespoke springs were from my stock.
Interestingly for those that do not know Janus is the Roman God of beginnings and transitions, doorways and passageways etc and is depicted as having two faces, one looking forward and one looking backward, a fitting trade name for a double door spring.
I also believe it was Smith who invented the first true door spring beating the officially recognised August 13th,1790 patent of Henry Downer for his "spring for shutting doors" by possibly as much as 30 years.
As always if anyone would care to acknowledge this blog post or any other it would be gratefully received and replied to.