Brian,
me again,
As it happens I am going to play with my aircraft tomorrow (Wed) down at Camden with my old Boss from my Navair days. He has his own business now call DENT AVAITION (not quite sure it was a good choice of business names as such) I'll run it past him, and get back to you - he's owned a couple of 150/152's so he may be able to point you in the right direction, or come up with a cheap fix for the problem at will get you back up and running
Let you know how I go tomorrow evening
Cheers