If they do end up crimping it with a pliers or channel lockes have them degrease (with brake cleaner) the both contact areas and apply some silicone sealant in the area where it will be crimped. This way if the crimp is not perfect it will not leak and also the sealant has a glueing effect if the area is degreased and would compensate for any looseness.
That being said some companies sell completely new axle assemblies for around $130 and I have rebuilts on mine that were less than $80 each.

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84 300D, 82 Volvo 244Gl Diesel