Polyethylene tube mounting blocks. Very cheap and easy to make.
They will not break due to the durability of Polyethylene.
Lighter than Nylon and Ali.
They can be used in one piece without the need to split clamp as they squeeze up under tension from the mounting bolts.
These are 30 x 30 x 8mm for using with 16mm tube.
I run a small knurl on the end of the pipe to help the motor block grip. This can be done with 40 grit sandpaper if needed.
I have not managed to break one yet even through some spectacular crashes
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