On one of my bows today, I noticed it had a scuff on the riser. I was wondering, if I put some tru oil on it, will it harm the other finish at all, will it discolor or be noticeable? Thanks!

I don't think you can go wrong with tru oil.  If you rub it a lot, it might dissolve the other finish that's already there, so to be safe, just dab it on to the scuff without a bunch of rubbing and see how it looks tomorrow.

Thanks!