Clever, but it doesn't seem particularly practical, is it actually useful?

Spoke to him last night, he was typing with one hand before it. After it, he could type normally.

Builder here, not the most useful thing, no, but definitely fun to build/play with. I got surprisingly fast typing with it actually.

No offence but 'smashing' to me means broken bones in multiple pieces. That contraption wouldn't work there.

You'd have been better off firmly taping a pencil to the underneath of your finger (with the eraser pointing forward for grip). This would have also acted as a splint in case there was damage to the finger

Still, any excuse to play with lego is good, I suppose!

That is awesome. I used to play with the LEGO technic kits all the time, I spent hours with them.

wait, did I see a trackball on that mouse??

It's a trackball, I have the same model. Very comfortable (at least is you don't have any smashed finger).

It's just a trackball.

Hey kids, don't try this at home (the smashing fingers part of it)!