definitely wrap it in some thing...my stock knob now has teeth marks from a channel lock on it. ive been rocking a cheap ebay that looks like this:
http://cgi.ebay.com/ebaymotors...ories
except the one i purchased was actually threaded perfectly and has a nice weight to it. not bad for a few dollars, does get hot in the summer in cold in the winter, but what would you expect from a metal knob?