So hopefully I am going to try and use the power of the internet to see if perhaps somebody out there has either parts, a salvaged one or has a Bardsley that is still functional and is willing to let measurements be taken from theirs with a view to then manufacture the parts required?
I contacted Jess the Door closer Doctor (also lives Stateside) who regularly takes a little time out to post on this blog and has stated that Yale did a version of this closer, known as the Yale/Bardsley, providing the picture below (I believe the Yale was also sold in England with Nettlefolds & Son being the agent as well as obviously America).
No1 1/2 Checking Spring Hinge J. Bardsley N.Y. Patented
I feel Adams is possibly earlier than the Yale because it appears Mr Bardsley patented it and later Yale manufactured it, probably under license.
I seem to remember reading somewhere that the Bardsley was originally $4 or $5 in or around 1900, how times change eh!
If any readers can help with Adams' Bardsley problem then please get in touch.