Talking about Gnomes reminds me of an incident at Odiham's engine bay, they used to replace lots of spools as with errosion as the blades used to get really thin, so on a rebuild they would change the spool. The chief used to tap over really thin damaged blades on spools being sent off, one of the guys had a complete new spool come in and not having seen one before as most were rebuilt, went to show his chief who on hearing "look at this" turned round and gave it a wack... needless to say it had to quietly be returned as damaged..
I can also remember the shaft on one Wessex from the combining box up to the main rotor box having to be changed, when removed, a bag containing new nuts, bolts and paperwork that had obviously been shipped with the shaft fell out of the end, It had obviously not been noticed on assembly tucked inside and new nuts / bolts had been used to fit it.