Hi,
I just had a look at my KJW M9, as far as I can see parts # 28 and 29 don't actually go in the slide itself. There should be a little hole in the safety switch (#26), first install the spring (#28) then the plastic pin (#29). I would think you would need to hold the plastic pin so that it won't fall out with your fingers, then install this half of the safety switch (#26, 28, 29) through the slide (#1) while still holding in the pin (#29). Then attach (#27) using the set screw (#25) to the other end of the safety switch. I hope I've helped you. If you have any questions just ask.
Merry Christmas.
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