Eye cup cleaning on Nikon Monarch HG

[Pinewood]

Howdy. I have a pair of Monarch Hg's and I have some sand or grit in the eyecup mechanism. They are non- removeable(poor design imo) and I would like to clean the grit out. Any suggestions?

 

[wapitibob]

I clean my leicas with water from the faucet. Every cpl years I send back and let leica give them the full treatment.

 

[Crashbutch]

They are nearly identical to my Opticron Traveler ED 8x32. I removed them to shorten the plastic barrels and rubber cups by 1.5mm. This gave me a full FOV with my glasses on.
The rubber cups are glued to the underlying plastic barrels. Carefully peel the cups off. Then you can access the 3 TINY phillips head screws that retain the plastic barrels to the ocular housings.
Work over a tray to capture the VERY small screws & detent pads. You'll need a phillips screwdriver for eyeglasses.
The rubber eyecups will need to be re-glued with contact cement.
It's really not that difficult but is a bit tedious.
Brian