I just received a Schick Repeating Razor from the large auction site. I bid assuming that it needed a good cleaning and that the finish was less than stellar, but that it was in good working order. When I unpacked it, it was open, and I tried to close it. The slide moved easily for maybe 1/32", then felt as if it hit a hard stop, so I don't think it's a lubrication problem. Can anyone here advise me on how to fix it?