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Bruce, I think you could skip the washers if there is enough surface area from the nut to spread the load across the inside of the cap. However, if they are plastic then I think you'd want to use the washers to increase the surface area. This will reduce the pressure peak(s) from torque on the bolt/nut.
For using the epoxy, if you use the washers and are worried about grip, I suggest you use a little bit of toilet paper on the epoxy and surfaces--as a composite type glue job. Get the pieces into position, spread the epoxy where you want it, then dab the tp into place. Make sure it gets wet w/epoxy. I have used this to repair a few things...such as my cellphone body.
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