pretty tough thanks

Very obscure. No idea about the 'thumb' group.

Er? If not obvious maybe fuller explanation would help realise why we got it wrong , thanks

@tvg - sorry, which group needs further info?

Thumbs

Thumb drive
Thumb through
Thumb tack - an Americanised version of drawing pin
Thumb piano - I'm guessing this is the one people are finding obscure. It's one of those African instruments with metal tines on a wooden board - you play with your thumbs (and probably other fingers). I'll add this to the answer.

@Smiley, have looked up piano and now recognise it under it's other name and drive though accurate and thus fair, a tad mean if I may venture to say. thanks

@tvg - fair play. I generally tend towards the 'doable' but it's hard to pitch them right sometimes - just depends what you know sometimes! Thanks for playing anyway.

@Smiley - no foul - no complaint 👍