Educate me now. I only have the shortest wobble extensions in 3/8" and 1/2". I've really only used the i/4" ones and have them in two lengths.
Question: Isn't putting the short one on a longer extension the equivalent of a longer wobbly? Other than using multiple wobbly's in a setup, is there any real reason to own different lengths?
Depends on how you work, the requirements of your work, and how hard you want to work.
If a 4 inch will not reach, and a 6 inch will not fit within the space allotted, you either need a 5" or to play with socket length or ratchet head offset from the handle. For instance, an SK 1/4 head ratchet has the drive anvil a solid 1/8" further from the handle than say a gear wrench. Well, if you need 1/8".....
You can also play with length with multiple wobbles to bend around obstructions. You need a 10" reach, obstruction 4" in. 6" wobble, joined to a 4" wobble, then socket. Kind of like having a swivel impact socket, attached to a swivel universal, for manifold bolts. It's almost 90* of socket throwing fury.