I was bought a Sinclair 81 and it survived until we got a 128+2 at which time I opened it up and binned the bottom half, tipexed the top half and turned it into a till... it did not survive! :-D
I still have the top part (the tipexed keyboard) but no motherboard

by the time the 128+2 was replaced I had grown out of that and the 128 still lives.
I now have a real till (Sharp XE-A202) so it wont happen again. :insane: