Be careful that the spring wire within the housing doesn't fall out and hit the eyelens. With the housing clear of the eyepiece, remove the spring wire from its groove. A toothpick may help you extract it. 4 To tighten the Instadjust tension, squeeze the diameter of the wire slightly smaller. To loosen the Instadjust tension, stretch the diameter slightly larger.
Small amounts make a big difference in feel.
5 Place the wire back in the groove in the Instadjust housing. It will float. Reinstalling the housing isn't difficult, but takes some finesse. Slide the housing over the eyepiece. Tilt the housing slightly to try to catch the two ends of the wire under the top lip of the eyepiece.