Regarding the caster-wheel replacement, you were very fortunate to find mass produced hardware of exactly the correct diameter and thickness!
Regarding the use of the flat-washers, I presume them to be made of steel, and of course the wheel-axle is also a steel composition (but likely not identical to that of the washers). In your design, the washer-holes are serving as axle-bearings, and I think the combination of steel (washers) rubbing on the steel-shaft, in combination with the small thickness of each washer will become a wear problem for you.
R Daneel Olivaw wrote:How the hard plastic case will be worn by the rotation of the axe ?
I will tell you that in few years !!!
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