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I agree that getting the helper on at the same time would be a good idea. I do think, though, that I will be checking my cable adjustment again after 200 miles or so to see if any stretch has put my cable out of adjustment.
On the helper spring: Note that, on '78 and some '79, there is a pin that holds the lever onto the transmission shaft which you must punch out: not detailed in the Bentley SC manual. I used a 24t hacksaw to break through the three layers that form this spring, but a Dremel tool or die grinder with cutting wheel makes short work of this.
Something else: the helper spring sits on a splined shaft that goes into the lever. In the body of the lever are two (I believe) needle bearings that hold the splined shaft, permitting this shaft and the helper spring on it to swivel when the cable is pulled. Support that pin at the bottom when you tap the new spring on so as not to cause sideload on these bearings.
When done, smear heavy grease into the spring to ease movement and trap dirt on the outside of the spring, instead of the dirt getting *between* the springs. Every so often remove the grease with the accumulated dirt, douse with WD-40, then regrease. Idea is that dirt cannot be by the grease if you put a tidy amount on.
Jw
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