BIG BREAKTHROUGH! I have freed off the mechanism and now the crank handle turns nicely. When I bought it (from Canada) I was led to believe it was in kPa not PSI, because it had three wheels- however, it is configured such that as the crank is turned, the numbers scroll up to 99, then flips the "hundreds" reel to "1"...but no further.

However, at that point, the limit spring and screw is fully across- so I am now guessing that I have a PSI model- am I right?

Morgan

(sorry but I am completely new to these devices!)

Last edited by Morganrue; Sun Jan 10 2016 11:54 AM.