Eye cups
SOURCE: I have an old tasco 7x-15x35 zoom binocular.
You can't.
Tasco optical products are very cheaply made items, usually bought direct from whichever factory already makes the same or a similar model and then Tasco have their badges and packaging added.
They are consumer grade models which are not designed with longevity or repairs in mind; they're worth little when new and almost without value as used items.
The only repairs which can be done are by Tasco themselves whilst their products are under warranty. Except for the most minor of repairs, a warranty claim will simply involve exchanging the faulty item for a new one as any labour expended in repairs will often cost Tasco more than the wholesale price of a new unit.
Your only fixes are to live with the missing eyecup; to visit a binocular repair shop (not exactly commonplace) and see if you can buy an eyecup which can be adapted by yourself to fit; or to replace yours with another pair. You'll usually find that there are plenty for free on your local FreeCycle or Freegle group but they'll often have the even worse fault of a broken eyepiece yoke. But the price is right so it doesn't really matter if you have to collect five or six pairs before getting a good pair...
With all due respect, 7x-15x35 are going to be optically atrocious, so replacing your current pair is not a bad idea.
SOURCE: I have an old tasco 7x-15x35 zoom binocular.
Measure the diameter needed and then check bicycle inner tube diameters. Cut a short section, roll a quarter-inch inside-out, slip over the eyepiece, roll the other end inside-out to form a nice soft shoulder. Costs nearly nothing, works dandy.
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