Then try this. I just did this with my SS SV105. Place the paling side of reel up to your ear and flick the spool at max brake and at zero. At max there is a very pronounced soft thunk sound of the inductor seating that is not heard at o mag brake setting. For me it is heard a fraction of a second after I flick the spool.
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OK, this is my last, last post LOL. I wanted to try this to see if I could duplicate what you are experiencing. I used my Sol with an SV spool and my Alphas SV105, adjusted the brakes, placed them to my ear and spun the spool but could not hear what it is that you are speaking of. I wonder if what you are hearing is the inductor being pulled back into place by the springs. When you spin the spool by finger the speed of the spool initially produces enough centrifugal force to extend the inductor but because you spun the spool by hand the speed quickly dies and the inductor is pulled back to its starting position by spring pressure. That's my best guess.
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Yes I am hearing the inductor being pulled back into the seated/retracted position by the springs. Obviously this implies that at some point during the spool flick the inductor was extended. For me at least the soft tick sound of the inductor seating is heard at max brake setting on the spool flick and not at 0 brake setting.
If this was a purely centrifugally driven movement then it would be heard irregardless of the brake setting and it would be the spool flick that is causing it to extend. This is not the case because it does not occur at 0 mag setting but does at a high mag setting.