>>2931025
ok so best way i can describe it is

the center geat is just there for now. the 2 gears on its left and right I need to turn the same direction as in one going clockwise and the other counter clockwise. theres a center gear you turn that when i turn it causes the other gears to turn. clockwise and counter clockwise. because when I move the center gear both the side gears would be moving clockwise instead of one being clockwise and counter clockwise.

honestly im not to familar with gear sets the only ones i can think of is planetary gear set but im unfamilar with how that would work and diffrential but with diffrential i encounter the same problem. What I want to do is put a spool on straps to tighten and pull around the spool.
what I want to do is set it up where i can put it on the back of some eyegoogles in a casing so I wouldnt have to worry about constantly replacing elastic straps. I know I could probably do something where I use a ratchet mechanism and make it simplier with some cord but straps feel better around the head then a cord.

I honestly just need to know of some gear pattern ideas that would help with what im trying to accomplish then I can go from there.