Had the same issue with a Motorola HS820. Motorola technical support was clueless. I finally detached the earhook as per the instructions for switching from right to left ear use. Soaked the earhook in a mug of boiling water (caution: boiling water can burn you) until it was soft and flexible, then bent the hook into a tighter curl, then held it that way under a cold stream of water until it set in the new, tighter shape. Replace earhook on headset. You may need to repeat this procedure from time to time.
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I've read quite a few posts from people complaining about the H500's earpiece being too loose and it flopping when they turn their heads. Here is a fix. After wearing mine for two days I was aggravated enough to try and find a solution. I love the H500 and didnt want to give it up,but the dang thing WAS loose... so :
1. Take the earpiece off just as if you were going to make it as if you would use it on the opposite ear.
2. Notice the sharp bend at the top of earpiece.That is where we will make the adjustment.
3. Get a candle or have a friend to hold a lighter steadily for you
4. Run sharp bend of earpiece thru the flame (DO NOT HOLD OVER THE FLAME) paying attention to the plastic,when it takes on an oily smooth look it will be warm enough to GENTLY push the two ends towards each other to tighten the hook shape. Run the earpiece under cool water when desired shape is reached and make sure plastic is cool. reattach the earpiece and place on ear.
5. Shake head side to side and that baby "shouldn't" budge at all. if it does adjust a little more using the above steps.
I hope this helps as it was one of the biggest gripes out there.
Cloudynights person says it was very difficult to get the cap off the hinge so that he could tighten it. He had to hone small screwdrivers until he could pop off that hinge (it is so well sealed for the WR rating, I suppose). Then he could get to the bolt that tightened the hinge so the binos stopped flopping about. I still don't know how he got that cap off, though.
Follow the shifter linkage back from the forward controls to the shift lever going into the transmission. Make sure the joints and bolts in the linkage are tight. My guess is the shift lever is loose on the shaft. If so, there is an allen head bolt that secures the shift lever to the shifter shaft. The shift lever is split and the allen head bolt is a pinch bolt. It's kinda hard to get to, but an allen head socket, short extension, and a rachet will work. Make sure this bolt is tight. Use a little penetrating oil before trying to tighten it. If it won't tighten, try taking the bolt out, chase the threads in the shift lever with a tap, and replace the bolt with a new one.
There is a smaller "u" shaped spring in the middle of the neck mechanism that I found one side was snapped off. Looks normal, but it's broken. I made one out of a coat hanger for temporary purposes and it works like new! I will order one from Hasbro. Hope this helps!