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I have 3 Chaos Knights, 2 from the Renegade boxed set and one Chaos Knight Desecrator. They are all magnetized, I've been using 2 as Despoilers and 1 as a Desecrator.

I'd like to go dual Thermal Cannons on all 3, but I only have 4 gun arms. I was able to get thermal cannons from my FLGS, trouble is I only have 4 of the mounts that hold the guns.

Can anyone tell me the simplest way to get 2 more gun arms? The ones I've seen on eBay are expensive, I don't want to pay the equivalent of a new Knight just to mount the guns. I thought about casting them, and do have the materials, but that's a lot of resin.