If I recall correctly... pumps don't actually have to be made out of magma safe materials so long as the magma doesn't touch the square you can stand on. Some magma pump related posts mentioned something about wear though...
oh, i know that. but wooden pumps will eventually deconstruct/catch on fire if used on magma (i still don't know how this exception works, but it's the case), I don't have any sand to make glass, and that just leaves metal for the pipes/corkscrews.
at this point i'm taking a little break, damn goblins wiped me out. kind of a funny story actually, The waterfalls i've been working on make the dwarves so damned happy that up until now i've literally been ignoring every aspect of this fort except my projects. no beds, no booze, no tables. the only thing they have to be happy about is a bunch of lavish booze-meals i cranked out ages ago, and the waterfalls.
I didn't even have a military or a single trap. each ambush I would just -let- the dwarves flee and be slaughtered until enough of them fought back to kill a few gobs and chase them off. even with the death (and subsequent decay) of several comrades each time round, just the waterfalls were enough to keep the lot of them ecstatic.
unfortunately the goblins kept cranking up the ambushes (I can't imagine why, I haven't upped my wealth at all... OH WAIT THAT DAMN ALUMINUM FLOODGATE!), so this last one was 3 squads of ranged goblins. virtually everyone's dead.
so i'll continue work on this tommorow I guess. maybe i'll find a locale with no goblin access since all i'm interested in is the devices