One of my Hornby HST power cars (circa 2008, the then "new" version, R2704 pack) has decided that after being last operated about four years ago without a problem it wants to play up. It initially crawled along at a very slow pace with only one bogie moving, and bench testing showed the mechanism between the cogs and the carden shaft at the No1 end (cab end) had seized so the good end was fighting against a static end. Stripped it down and built it back up one bit at a time, and its either the housing around the brass thing which I'm going to call a worm drive, or the worm drive locking up against the cogs. Anyone any ideas on a permanent fix please? For now I'm running it without the carden shaft and the brass worm drive so it's only powering one bogie, which seems to have negligible effect on performance but it doesn't feel like that is a long term fix!