I've got a customer with a Sylvania (GTE) QSF 20 Fusible Panel Switch (pic attached) which won't allow the handle to be rotated to the "on" position. The knife switch mechanism inside is operable, the problem is isolated to the handle mechanism. The lockout slide moves freely but the handle won't. The customer doesn't want the expense of a rebuilt/used unit nor do they want the downtime to R&R the switch (I know, it's a dumb position - they'll come around eventually). I looked for a way to take the handle apart, but counldn't find one. Anyone ever work on one of these?