John, if you want to try it, this is likely the spring:
http://japantackle.com/tuning-parts/spools-casting-reels/tu001003.html
There is also another procedure you may like to try.
Before removing the inductor assembly, make note of where, on the inner surface of the spool, where the nylon blocks ride on the spool. These blocks are what forces the inductor to move against the force of the spring. Polish the inside face of the spool in that area. You will also be polishing the spool shaft at the same time, if you use the right size felt wheel, or brush to do the polishing.
i tried this after observing how the inductor moves when accelerated. I chucked up a spool in my Foredom tool, and accelerated it up to the point where it started to move, and decelerated to see when it would retract. I was just curious to see at what speeds these movements would occur. I found the movement to be very inconsistent. Not at all a smooth exrension and retraction. Rather jerky, in fact. I said to myself, self, you can improve on that. Thus the polishing experiment.
After several disassemble, polish, reassemble and test cycles, I was able to get rid of the jerkiness. Also the speeds at which extension and retraction occured were much more repeatable. Dont know what the actual speeds were, but were well below the max speed on the Foredom, which is, if memory serves, 18000rpm.
I have done this to three of my reels, one Zillion, one Fuego and one Alphas. I slight improvement was noticable, most in the Alphas. Not, I believe, due to any inherent differences in the reels, but rather, a difference in application. I use the Alphas reels on my lightest power rods, with lightest line, for the lightest baits.
I havent followed this up with more reels. Reel tuning has definitely taken a back seat to rod building at this guy's shop. And, this is really a marginal improvement. But, this may be of interest to the truly afflicted.