I pulled my 336 Marlin 30-30 out of the safe last night to show it to one of my sons and was going to check it for being loaded before giving it to him and couldn’t get the lever to cycle. I couldn’t find a problem with it so I put it back in the safe until I could check it. This morning I started to take the lever off, before gong to work, and it will not come off. It was working fine when it was used last. The rifle is about 2 years old and I have never had a problem with it. I am looking for suggestions for what the problem could be.