Guitar Head Dulcimer Plan Needed

Does anyone know of a source for a dulcimer plan with a guitar head, instead of a scroll head? I have searched the inter-web extensively for one. If not, I know there is someone on FOTMD who can provide a crude drawing of how the flat head is attached so that the string tension doesn't rip the head off. How does McSpadden do it, and why are all the dulcimer plans scroll head type?