I have a Marlin Model 336 caliber 30-30 (Made in 1963) that hangs occasionally when I try to open the lever. It hangs when the lever is open about 1/2 inch. Usually it will open if I close the lever and then re-open it. It dosen't do this every time and does it very seldom if I work the lever fast. Does anybody else have this problem? Does anybody know how to fix it? Thanks in advance for any help you can give me.