Thanks Clive,

Hi Gary, I think the design on the 150's is esentially the same as the 400 (excepting the difference in dimensions) so I recon the same design of retainer would be compatible, i'll have to take a look at a 150 to double check as the motor drawings on the robotmarketplace website don't give enough information to be able to confirm. It should be easy enough to adjust the program to alter the size of the retaining parts to suit.