halocline
Contributor
To clear the air-I do not know much about rebuilding regulators. I took my R109s to the local scuba pro dive shop so they can be upgraded to r156. The tech said that he was able to upgrade, but the spring was way to stiff and breathing would have been crazy.He said he has done this in the past without problem. Could this be because of the leaver?
Apparently that tech is like you, in that he also does not know much about rebuilding regulators. This is the 2nd thread this week about a "professional" tech using the wrong spring. If you saw those two springs you'd laugh; the unbalanced poppet spring is twice the size.
What's even stranger is that the balanced spring is the one used with the exact same poppet on the G250 and S600, which are two very popular current SP 2nds. IOW, any tech that has rebuilt either of those should be quite familiar with the spring.