If you read the post linked you will find Jerry said:
Our laser programmer screwed up by not putting a 1/4" hole in the tang and ran approx. 150 of these before catching his mistake. These are not hardened and are ready for grinding!
Should be the same tang to fit the mudder handle. All mudders previous (which woul include only the Bog Dog D2 and the Bog Dog SR101/52100) had holes near the end of the tang for the lanyard hole as well as to fixed the grip on with the expanding spacer.