Bill, I get what you mean but so far I had no problems with these tracks. I painted and weathered 4 sets so far and 2 of them are installed on the models, 1 of these traveled around Europe with me and was handled through airport security, hand luggage, etc. No problems with pins falling out or smth like that. The holes are tight and they just sit there.
Moreover, Masterclub's owner, Sergey, claims that they did weight tests and the assembled chain holds up to 3KG of weight without braking the pins.
If you would like to ask me how this was done from the technical point of view - I have no idea, sorry. I think I've read somewhere that the bored holes have slight conic shape inside, but I can't be sure if that was regarding these tracks.
Here Terry wrote that he had a couple of pins not sitting in their holes, but overall they do
http://www.perthmilitarymodelling.com/reviews/vehicles/masterclub/mtl35023.html