Well that is a real downer of a result. You were honest about the modification and it does arguably void the warranty - but still when Novatac bought the HDS design and parts - it is assumed from Henry's comments that the asset deal also involved assuming the liabilities for support and parts. Which apparently has resulted in zero parts and zero support. It makes you wonder what the answer would have been if you had a non-modded light bought from a dealer... Heck, you weren't asking for warranty service, just some parts support...
Personally, this sours me a bit to Novatac. Orphaning, intentionally it seems, a product for which you've assumed liabilities smacks of built in obsolescence in order to sell more new Novatac lights. IIRC they purchased the HDS machining so they could, conceivably, make parts and sell them. Seems like the better business decision.