What a job. I spent 4 hours on the rear screw that would not budge. Tried every trick I could think of. The other screws were in there but all came out with a little tap on the end of the screw driver. The last screw I had to drill the top of the head off. I was trying to save everything intact but that last engraved screw is done. I set the mounts in. The front one was tight and I took a little off with a stone. I have just left everything alone for the night as I am done in. Thanks to everyone for their help. I am going to put the release lever on the left and pivot the front counter clockwise. I will mount a new 1x4 leupold.