When creating a custom item there are tick boxes for selecting the "item equippable locations". How does this work?

IE. If I only select Left Hand, will it only be equippable in the characters left hand or do I have to select both hands to get it to be held in either hand? I'm wondering if I select both is that also potentially interpreted that the item needs two hands to hold?

Could I get some clarification on that?

You're overcomplicating it :P

The tick-boxes are as straight-forward as they could possibly be. You select the places where the item ought to be equipped. A (not detrimental, but notable) side-effect of the system in place is that you can create items that can be equipped to one hand but not the other; however, you can not create items that need two hands to hold.

Uh... yes you can. Both hands literally means (or it did before the system change) both hands. As they changed from left & right to primary and secondary, perhaps not. But both hands used to mean both, not either.

There is not now, nor has there ever (to my knowledge) been, a "both hands" check box under the Custom Items Exchange.

Thats not what Jevon said - he said that ticking both hand boxes, makes the item a 2-handed item.

I see; I misunderstood. In any case, in my experience ticking both has meant that it can be equipped to either hand. It has been a while now since you could equip to one or the other hand, though, so I may be remembering incorrectly; and the new equipment changes really have made it a moot point.