Having trouble finding any decent condition real big bars for milling for sale anywhere at a decent price for my MS780/880, and new they're a small fortune. Hadn't really wanted anything beyond 60" but Left Coast Supplies seems to have some Husqvarna mount GB 72" bars for the ridiculously low price of $200. (Most all their other GB bars are sold out.) I know you have to mill out the slot from 9.0mm to 12.3mm and probably drill a new tensioner pin hole, but I was thinking even if a machine shop charged $50-100 to do it, it would still be a bargain. I could probably do it with my 20" Jet drill press, but I don't have any carbide burrs and I don't have an X-Y vise either, and would rather have it cleanly and professionally done. Any thoughts on the viability of this?