The Puma's accessory drive was invented to power the self-propelled undercarriage. This was a monstrosity that consisted of a tracked bogie with skids either side of the nosewheel. Engage accessory drive, start up No 1 and drive your Puma around the countryside and into cover etc.etc.. They flew it but it didn't retract or work very well so they built a rig consisting of the bogies and nosewheel with a pump for the hydraulics.
It would depart The hangar at Marignane and chatter off in the distance. There would be a GodAlmighty BANG and the staff at the hangar would check the time against a sweep they had held in the office.