Yes it is done without much dismantling but requires a slim build plus agility (characteristics of the RTCC mechanic who did the work!). Job was done within the hour that MMC indicated it should take. The new arm does have an indented end that nestles against the torque tube.
Many thanks for the information. I meet the slim requirement but not too sure about the agile :-)
I have sent an email to Adrian at MMC saying I would like to do the job myself and asking for the kit to be sent to my UK house, where I will be for a couple of weeks in 10 days time.
