also, the wheel off-set may come into this, but in the end, if there is a spacer between the two inner races, so there isn't any side loading on the bearing, or very minimal, the bearing will last a great deal longer.
As for the LiPo fitment, it is a toughie, with different designs out there for cell casings, it would be hard to design a one fits all placing gadget, although, I agree, that gluing bits to the bottom of the cells can cause issue's in fitment in other cars due to height...
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