We have a JD 5460 self propelled chopper and in need of a replacement knife sharpening stone. The Murphy Stone was an aftermarket attachment that was capable of sharpening the complete width of the J Knife and worked well.  They have been out of business for sometime now and all the aftermarket chopper specialists have since exhausted their stock also.  If any one would perhaps know somebody that might have one, we sure would appreciate any leads.  We believe the Field Queen Murphy stone part was the same size.  The one we are in need of measures 23" long, 3" wide, and 1 1/4 tall.   As mentioned, the chopper parts specialists in Kansas, Iowa, Minnesota, and Ohio no longer have any.  

 If you know of a company that would cut a piece of stone, I would be interested in that too.  The two companies I have contacted seem to not be interested in a single purchase, guess we need to order a 100 of them. Ha!