David,

I was thinking something really close to that, very Curare-like'. A pain but it works. Hoping for simpler, but the block wouldn't be simple, it would be a real pain to get even, plus the weight factor.

The extra hidden lines on the plan is the problem figuring it out, very not like the Curare. I'll play with some 3D CAD later and see what comes of it.

In the meantime, I hope someone out there can shead some light on this.

Don @ Eureka...