We recently bought the GJR at TSC to use on a Case backhoe that our company just purchased off lease. Needless to say, as a lease unit, I think the grease gun at the Case plant was most likely the last one this machine saw until now. Almost none of the fittings would take grease. The GJR worked great. Some fittings took a little more work than others, but the tool worked perfectly. I wouldn't hesitate to recommend this tool to anyone.