It's worthwhile to keep one on you at all times. Tungsten Torque Bars can be crafted and used to open up special item rooms, just like Upgrade Nodes in the previous games.Since your Benches have a safe with unlimited(?) storage space you shouldn't sell things unless you can really use the resources. It will typically give you half the resources for an item that you would need to craft one. You can sell most items at a Crafting Bench.This is useful for tools you mainly use for their utility, like the Rotator Cuff or the Force Gun. Those affect both tools since a weapon reloads them at the same time. Upgrade circuits will only affect the tool they are inserted into, with the exception of Reload circuits.For example, the Line Gun will always have a low Rate Of Fire. Keep in mind that not every kind of circuit will show a noticeable improvement depending on the tool. Upgrade circuits are not permanently attached and can be easily removed.The Probe Gun is something you create for a mission and you get nothing for dismantling it afterwards. The Planet Cracker is the DS2 bonus weapon and you can't put the parts back together. Special weapons that you might NOT want to dismantle are the Planet Cracker Plasma Cutter and the Probe Gun.Just experiment with creating weapons! Under the Solo Campaign menu there even is a Weapon Crafting Arena to test combinations with unlimited ammo. It costs nothing to dismantle a weapon and ammo is universal.That's it, there are no other differences. Elite already has all circuit slots unlocked and costs 80 Tungsten to craft. Standard has 4 additional circuit slots that need to be unlocked for 20 Tungsten each. The difference between Standard quality Frames and Elite quality has to do with upgrade circuits.Both of them have different tool combinations, but the Heavy Frame has a lot more options. When you assemble a weapon you typically choose a Compact Frame or a Heavy Frame.It's easiest to just keep playing until you see a progress save notification before quitting. There are 'progress saves' and 'inventory saves'. The game only has auto-saving, unlike the previous games.

If you are on PC there are online guides on how you can fool the game that you have those files. You get a bonus weapon for a Dead Space 2 save and a bonus suit for a Mass Effect 3 save.

Dead space 3 early game weapons