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It is always good to learn something new. There are fewer and fewer of us who do this kind of repair (fewer than you think as the majority of Camera Houses, Fletchers Fotographics, and other binocular/telescope type shops used to send them to me until I retired) so rather than lose the expertise I am happy to give advice to someone who has an interest. Keep mucking about with a cheaper pair (those with grub screws pushing the prism off vertical are fine for that) but your good Japanese ones (early TASCO, YOSCO [York Optical], AMASCO, ASAHI Pentax etc) you may like to consider sending to a reputable repair agent (such as Servicing Optics in QLD) until you become more confident in doing collimation.
Regarding the rhomboidal prism, think of it as two Porro prisms separated by an air gap. That's how I created my first one with a 6X finder from an old Japanese telescope. Making equipment is not has hard as you may think!!
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