I've made a couple of these now and finally I have one I like!
It was hidden inside this block of steel ...
But a few hours on the Mill coaxed it out
Perhaps a little larger than originally intended and weighing a little over a pound it's quite a lump but fits my 4" BV20 nicely.
Tangential tools can't do everything but are really cheap to run using any small lumps of HSS, round or square that may otherwise lay unused.