Taking Apart the Orthophonic Reproducer

I would like to take apart one of my Orthophonic Reproducers. How is it done? What tools, prep and techniques are involved?

Thanks,
David

Come on guys and gals, do you all mean to imply, through not responding, that no one here has done this?

Here's what I've guessed:

1. Spanner type tool similar to that used on bicycle bottom brackets. I've bought one for bicycles and filed it to fit the retaining ring holes, and spread the width to match the spacing of the holes. (this is the type of tool that I use to remove the retaining ring from the vintage Conn saxophone tuning barrel)

2. Penetrating oil to wick into and around the retaining ring (or should the whole reproducer be soaked?)

3. Method to hold the reproducer while unscrewing the ring?
* vice around outside or strap style wrench
* some method of holding the inner part that attaches to the tonearm either from the outside, inside, or by a bar through the 2 screw holes, or is this part too fragile?

I've got a few pot metal reproducers on hand including some that appear to have started to explode from attempts at dis-assembly, and a few that seem to have beautiful pot metal.

Someone out there has got to have experience with this.

Thanks,
David