I recently fitted a new door and frame to my firewood store. It came with hinges and the latch but no lock cylinder or handles so I had to buy those later. The cylinder lock seems to be the right overall length to fit with the ends flush to the surface of the cut-outs in the handles but when I screw in the fixing screw it only fits with the cylinder poking out too much on the outside and not enough on the inside. I tried inserting the cylinder either way round but it makes no difference. Do I need a different lock with the lever and screw hole offset toward one end?