Thought some of you might enjoy seeing this. In doing disassembly to repair transmission on my 51 B John Deere, I found this example of safety wire on the bolts heads holding the crank shaft main bearing housing right side. Guess the last shade tree owner who had these bolts off couldn't remember the correct size wire. It should be the size that can be seen on the cam shaft quill. The correct size is 16 gauge.