I have to modify a Rickenbacker toaster to fit an old Rickenbacker neck position that doesn't have routing for the slugs (they used to use shorter slugs in the neck). As a general rule, what difference is there between otherwise identical pickups that used two different lengths of alnico V slugs? The bridge position and all current toasters have magnets about 1- 1 1/8" long and the necks used to use approx. 5/8" long magnets. All the extra length is below the bobbin. Just wondering what the difference is if I pull and replace the slugs with the correct length.