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So you have removed the trigger housing? From the video it looks like the trigger housing must be removed, then you can drop out the retaining pin. From what I saw on the video you then need to depress the bolt stop in so that the opening lines up with the remaining pin inside, then turn upside down and possibly tap gently with something that wont damage your chassis and I would imagine the pin would drop out. If you watch that part of the video you will understand what I am trying to say better.
It shows the part I am talking about from about 2:45 to 3:50
I did some research and it turns out I was on the right trail. I found this:
"One minor gripe that I do have about the stock pertains only to the Tikka model. To remove the bolt stop retaining pin, you have to remove the trigger guard/magazine well piece and tap/bang the stock to remove the pin by inertia. When we first tried removing it from the stock, it took us way too long. I was about to resort to more drastic measures when it finally came out. "
Kind of off topic but it would really be nice if MDT posted some weight comparisons to the factory stocks they replace. If it is not lighter than original equipment I am not interested.
Well I don't have an MDT chassis but I did have pretty much the same problem at work the other day, dropped a .075" pin in a hole in a die and couldn't get it out.
Did a little thinking and came up with this idea.
Take the ink tube out of a pen, the one i had, had an ID of .100" so I just crimped the end with my teeth, put it down the hole and press over the pin and job done. I just went to the gun room and tried it on my Tikka, I think this should work fine for you.