Thanks everyone for your comments. I'm a bit of a perfectionist and could have carried on tinkering with it for years but 'him indoors' insisted we put it out as is. I'll get it just right in stages.
Marg,
My hand has healed thanks Marg, but all the nerves are now right on the surface. I hit the roof the other day when I forgot and picked up a piece of toast with my right hand.
I guess I'll be wearing a thumb stall for the forseeable future. That'll teach me.
I've still got to make the box I'd started for a customer when I did it.