I think I can understand why beepbeep is a little apprehensive. I helped a club member do a valve adjust on his 930, and it was a major PITA. Had to remove a *lot* of plumbing. $570 seems like a bargain thinking of what my friend and I went through.
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'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
The Blue Bomber's Website
"If it ain't broke...we'll help you fix it 'til it is!"