I recently purchased a JP Sauer & Son Mauser 98K made in 1934. Any advice on the easiest way to disassemble the bolt for cleaning would be appreciated. I know the “donut” in the stock is to assist in this endeavor but that is about the extent of my knowledge. Also, once apart and cleaned, what is the recommended procedure for lube? Is the firing pin channel supposed to be dry? Any advice would be greatly appreciated. Thanks! Art G.