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I just had a "Eureka" moment. I have recently been spending a fair bit of time re-designing the power transmissions for some of my GBC modules. I made sure that everything was properly braced, all the axles were supported in at least two places, etc. I also took the opportunity to include one of the torque-limiting clutch gears, in case something goes wrong and the mechanism binds. My realisation was that if I'm going to put in the clutch gear, I don't need to go overboard re-inforcing the structure - I only need it to be strong enough to withstand the amount of torque that the clutch gear can provide, rather than being able to withstand the torque of the driving motor. The clutch gear will slip before the bricks come apart. I guess my point is that bracing and structural soundness is all well and good, but it is certainly possible to make it far sturdier than you need. Owen.