I've searched for obsidian for making the shock absorber and I can't craft lava, magma block, obsidian, blaze rods and powders, if someone has found something...
I used the Drying Basin, I think it was, to convert the one bucket of lava to netherrack (or maybe magma cream, then netherrack, I can't remember for sure). Then, ResGen the netherrack, and use either a squeezer or magma crucible to convert it back to lava.
As far as I can tell, only works with a magma block (4 magma creams) which I suppose you can get from a nether mob farm. Nice.
Check your NEI.
You can use the Mechanical Drying Basin to convert 1 bucket of lava to a Magma Block.
Then use the same Mechanical Drying Basin to convert back to Netherrack.
I don't remember if this works with the regular Drying Basin. It might have required the Mechanical one.
I think I put the one lava in a fluid transposer, then ran that lava over Brick (from clay in a furnace) to make individual Nether Brick (250mb of lava each). From there, make the Nether Bricks, and ResGen to make a Magma Crucible.
It mostly depends on where are you in quests/challenges.
If you have access to Glowstone dust already I recommend to pour Redstone on it with a fluid transposer and use a mechanical squeezer to make the blaze powder into lava.
You need :
for a bucket of lava.
Or go the hard way and make a Lava Fabricator which will produce a bucket of lava for 200.000 Rf.
Or if you need immediately and you only have a Magma Crucible and some obsidian you can make 1 bucket of lava with it from 1 obsidian and 300.000 Rf
But I use the Glowstone method instead.