I just picked up this rifle and didn't inspect it properly. It's probably a 1967 production, ser #1019XX, no letter prefix, in 270. Problem is with the bolt in the safety does not slide completely into the "SAFE" position. It slides far enough back to to keep the rifle from firing but not as far back as it should go. With the bolt out the safety slides into positioning normally. The rifle shows little wear but was restocked with tiger walnut at some point. My first thought is the bolt needs disassembled and cleaned. The bolt has been recently heavily oiled and I suspect someone tried to loosen dried grease up with oil rather than cleaning. Any ideas?