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I never did find out what kind of glass compound polish you need as the article doesn't specify, but I had no problems removing the lines from the glass with a dremel tool (6-8 hours a lens I'd guess). Shoot that reminds me I really need to post that up.
The necessary gear is available at a rock-shop/lapidary supply. Cerium oxide is used to polish glass. If you grind glass, do it wet with water not dry. The particulates from glass grinding are not lung conductive. Nor is the slurry of cerium oxide if it begins to dry out during polishing. Be safe.
The time it takes to grind the glass and polish...far more efficient to just buy them. As well, the inner surface of the lens will not be parallel with the front surface. For the purists, this may alter a small percentage of beam performance. That is just being nit picky though.