As the others have noted, between design and materials, there's no good way to get them apart/opened up. There's no reason to think that there's anything complicated in there -- the dead spot you're experiencing is even a little surprising -- so it may be a matter of some water got into it, either rainwater or condensation, and caused some corrosion that is breaking the contact in that one point.
Before trying to crack into it or buying another, I'd pull it off, try to get some solvent (WD40, electrical parts cleaner . . . ) into it, around the shaft and under the button,, and spend an evening or two working the button in and out from time to time while watching TV over a couple evenings, with regular additions of more solvent/cleaner, to see if you can break the crud looose and get it back working properly.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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