Yeah as a last resort. I am not saying the listed price is not fair, but, it's a lot, and the valves themselves and stuff are cheap brand new - 40 - 60 bucks each. So I can rebuild the whole thing for less and have brand-new parts. Reliability is very important to me, I take the truck to really remote places. If it doesn't work out on the cartridges - finding conversions to modern parts, and I think it will because Parker still makes cartridges in the 10 series orifice - I'll probably build an entirely new manifold from commercial parts. But we'll see.