The trims were attached by a u shaped bracket bolted at each end to the hub.A spring clip in the centre of the bracket passed through a slot in the centre of the trim and secured the trim under pressure.
Much to the annoyance of Head Office, certain depots removed them as soon as possible with the regular excuse of ‘lost in service’. The real reasons for removal was brake overheating, time in removing and replacing them when wheels had to be changed and, most importantly, the need to regularly check wheel nuts for tightness which later became a mandatory regular check and, as I understand it, it was at that time that the London wheel trims disappeared in short order. They all seemed to disappear from buses almost overnight. This was, of course long before the days of wheel nut indicators or hubometers, so the ‘falling off’ incident sounds eminently plausible.Thus the Broadway/Chiswick dynasty that had effectively reigned since the days of the General came to an abrupt end.All new brooms like to be seen to sweep clean, even if some of the items thus discarded are of benefit.The trims were a tight fit around the wheel rim so if the spring failed the disk would initially stay in place by centrifugal force.A change in speed or an uneven road surface would, eventually, dislodge the trim but with LT’s vehicles engines governed to low speeds and, even in the country areas, slow traffic, I just wonder what speeds could be attained to have the trim fly off so as to cause injury.