Trust me pjmcla we thought long and hard about mimicking the Biffle Hard Head. I don't have a simple answer as to why we didn't or haven't done it but I'm sure it had something to do with the fact that we already had the Ear Ball molds and I'm pretty sure they did a little research into the sales history of the Biffle Hard Head at larger retailers (Bass Pro, Cabelas etc.)
Here again, based on the production process of a Do-It Mold, it's hard to do every great idea that comes around the bend. Trust me I was pulling hard for something like this from the start. I hope it remains a popular technique for years to come 'cause it flat out works. We will see.
Until then, I'm afraid we'll have to modify existing designs or have a blank machined to do what we want it to do. I appreciate the input.
Jerry