I took my VP9 apart for cleaning. When putting it back together I put the slide on before inserting the disassembly lever in the frame. The slide is on and will lock back. It will go forward to the point where the slide is 1/8 or 3/16" in front of the frame. I realize I did it out of order, but how can the slide be removed from the frame so that I can put the disassembly lever in?