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Cheap Hobby parts are cool and we love them to get started out - but it never works with tools :(
- you need "the best tools you can afford, becuase they will last" - Carbon Steel tools are the go.
this 0.9mm" Hex is the correct tool for T-Motors 2300kv grub screws inside motors - We checked with T-Motor and they confirmed the Tool size is 0.9mm - We did notice however that although these tools are EXACTLY 0.9mm that the grub screws used by T-Motors are poor/low grade - as our measurements of the T-Motors 1806 grub screws is 0.95mm - ie the hole is too big - and the tool needs to be heated before putting it inside the grub screw (expands it slightly)
1 x 0.9mm precision tool - Hex - metric for 1806 motors