I just bought a used Winchester Model 94 Centennial Model scoped with a Bushnell 3X9 scope from my favorite pawn shop. The gun appears to be in about 98% condition save for a small stock ding which I can fix. The scope is clear and reticles sharp. However, the 3X9 adjusting ring on the sighting end is VERY stiff and will hardly turn/adjust at all. Any ideas on why this might be and how I might loosen it up. I'm not too keen on using a penetrating oil for fear of it leaking or outgassing into the optics. Thanks for any comments you may have.