Here it is with the larger O-ring, mounted on a hammer handle which is 28mm x 35mm and it's nowhere near at the limit of the O ring. Plus you can get any size O ring you like, I've seen 4 inch ones in the hardware store.
It doesn't have any facility for side-to-side motion. I've had acceptable luck swinging my Dinotte maybe 5 degrees one way or the other, but this light has a better grip on the bar, and I don't think it'd swing much. My bar bends around, so I can usually get it pointed right by picking a good spot along the bend to attach it.
If you only need maybe 5 or 10 degrees, I'd make a shim if it were me. Either that or put the lights on an accessory bar like the Minoura space grip; might be a good idea anyway with more than one light.
no subject
It doesn't have any facility for side-to-side motion. I've had acceptable luck swinging my Dinotte maybe 5 degrees one way or the other, but this light has a better grip on the bar, and I don't think it'd swing much. My bar bends around, so I can usually get it pointed right by picking a good spot along the bend to attach it.
If you only need maybe 5 or 10 degrees, I'd make a shim if it were me. Either that or put the lights on an accessory bar like the Minoura space grip; might be a good idea anyway with more than one light.