Mike I don;t believe the extension is necessary for the later model unit I have. I haven't been game to strip mine as of yet, deciding to wait till an adapter is available and do collimation only once. Plus I may get it out and use it in the interim till the adapter is available.
I'lll have to set up my mill to drill and tap the holes unless I get my engineer to do them, not sure yet.
It seems I have a lot happening in different areas of my life at the moment and I have no idea when I might even get to it once I have the upgraded rear plate.
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