Is that the spring under the power valve, that raises it when vacuum drops? If so, I've probably got a few spare ones. That carb was one we used for training several years ago, and I've got the training carbs stashed away somewhere in the school shop. Email me!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!