Fitting the Finder & Flash - continued

The most important part of this fitting is to enlarge the mirror post hole. The 110A's original mirror post screw is too small and short to accommodate the 900's. To fix this, you must have a drill press and a threading tap for creating a larger screw hole to accept the 900's post. Without a drill press, you can not be sure your threads are properly aligned. If you don't have access to a press, I do not recommend this part of the conversion.

Luckily, I had been granted access to a large materials lab filled with fancy toys, like this bad boy.

You don't need something so fancy, just something that allows for a slow speed. And, of course, a vice is a must for this.

These photos show the camera has not been cut, as I had not done that yet when I was using the press.

To enlarge a threaded hole, you must know the size of the screw. In this case the hole needs to be enlarged to 10/32" (also known as a #2 BA).

First, find a 10/32" straight flute tap. Using the slower settings of the press, enlarge the hole with a slightly smaller drill bit. Switch bits to the flute tap and drill the threads very slowly with some lubricating oil, backing out even slower.

Test your new mirror post hole, should be smooth as buttah. If it is not, uhoh, something went terribly wrong.

Fortunately, I had some good help, thanks Mike B.

I've said numerous times that I won't be using the flash screw. The reason follows.

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The Models

These are the models I have personal experience with and are used within this site.