Saddle soap... nope. T'would loosen the head.

Ya know, this may sound strange, and I am talking off the top of my head, pun intended, but, is there any odor? Does it smell like Guinness?

The lemon juice idea sounds interesting. Whatever you try should be on a small area about an inch from the egde on the least worn part of the head.

Gosh, I am anxious to see how this turns out. I know if one of my babies were in this state, I would be pissed!!!