I quite like the idea of
"watch your children play with toys you made"
Whilst showing a picture of someone with a young lad hanging his head over his arm whilst he "demos" the thing.
'That's it son, put your neck out, don't worry its got an on/off switch'
"Grandad you try, its easy you don't even need a steady hand to become and expert"
Nice idea though, do they do a Katana version? Stretch goal suggestion maybe?
Sadly I simply don't have the spare cash for it. I will have to remain an amateur, doomed never to reach expert levels.