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In the Chinese-made RA-88's and -70's, the focus is so close to the optical window immediately behind the last prism face that the eyepieces for these instruments must have their field stops right at the very bottom of the barrels.
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If one wanted to use a 1.25" eyepiece (which would have to have its barrel "padded" so as to fit more snugly), the barrel might have to be cut shorter so that the field stop is at the very lip.

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I wonder how the Miyauchi's fare in this area?

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I surely don't know ... cheers.

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