I'm having a lot of trouble shaping the foam on my V Star 1300 solo seat. A electric carving knife only works on flat or convex surfaces, not on concave. My goal is to shape the foam then adapt veg tanned leather over the foam after tooling a design. So far I've learned that the foam has to be very smooth, otherwise the bumps and irregularities in the foam will show through. If I cannot shape the leather myself, I'm taking the seat and have MREDMOTO in Albany Oregon do the foam part.