The MFU you purchased can be post-mounted, or the thread holes used for the post mount attachment could be utilized in attaching a right-angle bracket. I mentioned a couple of models from Newport or Thorlabs earlier in the thread as possible solutions.
I do not have a Nikon MFU at hand so I can only indicate possible solutions.
The Olympus BHMJ focus plate extends 10mm below the block and 20mm above the block. Post hole on the BHMJ block measures (I.D.) 21mm.
Regarding the base; the picture in my previous post shows an optical breadboard. This one is an Edmunds Scientific 12" x 12" and they are heavy. Newport, Thorlabs and others make similar and in most cases compatible versions for securing attachments or additional devices.
I chose to use the XY translation stages under the BHMJ; but an XY microscope stage attached to the BHMJ would most likely serve the same purpose; but they are a bit 'bulky' and have certain mounting requirements. I was happy with the accuracy of the translation stages, plus I already had them on-hand, and they bolt to the optical breadboard.
The stage I will be using will be attached to the nosepiece bracket on the BHMJ. There are a couple of ways of accomplishing this non-destructively.
I could use a microscope stage, but I'd prefer to use a custom stage that accommodates my requirements; which include recessed, interchangable, circular 100mm stage plates (glass, black, white, balsa, nothing) and will also hold a 62mm iris diaphragm on the underside for use with substage lighting.
The stage I am putting together will measure 7" x 6". This allows sufficient area to accommodate specimen holders and other devices etc, as or if required.... The XY aspect is an important consideration and so too the ability to rotate the various stage plates within the recess.
One of the advantages of these focus blocks is their ability to move considerable weight with no impact on accuracy or performance; but the most important feature is the amount of fine focus travel they provide.
Quote from Charlie's post here:
http://www.photomacrography.net/forum/v ... php?t=2825
That piece has proven to be wonderful! It is from an Olympus BHMJ scope. The total travel is about 30mm (1.18"). The fine focus knob is calibrated into 200 units... and you can easily make 1 unit changes. (Also, you can travel the full 30mm with the fine focus if desired... unlike some blocks where fine focus "travel" is limited).
A full turn of the fine focus knob moves the platform .2mm (.008")
So one unit on the fine focus moves the platform .001mm (.00004")
And it is smooth as silk!