I had my Revo for about a month already and notice I an issue. I might be just me but when I place the string in the gripper and pull tension it works fine. But when I release the tension the string is still in the gripper. Sometimes I would need to just give the gripper a lil push/pull to release the strings but the other night it really held on to the strings and was very difficult to release. Do I need to clean it? I was going to use WD40 however it was a big investment and dont want to do anything with out any advice first. Thanks.