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@aufbruch
In terms of temperature, the one I've seen quoted for HDPE is 220 C. You are meant to heat it until the melted beads of plastic are around 1/8" in size. Too much force results (at worse) in a convex join so I think we would be able to work that out after a couple of attempts.
If we try it with ABS, the danger would be that too much heat will cause it to spontaneously burst into flames (because the plastic is polystyrene based this would be particulary nasty).
So the problem is ready made HDPE/MDPE caps...