Oh my goodness, that is such a good idea. I had been racking my brain trying to figure out a way to apply leverage to the blasted thing. So simple. <3

I can assure you I acquired a 10s link.

As for leading the chain properly through the 105 I made sure to both look at another bike and my BBBook. Plus there is a little metal bit preventing me from leading it through the other way to the bottom pulley which means I can't lead it through the upper pulley for that purpose. Thanks for the quick replies, I am gonna get off of here tonight. I will post the pictures, hopefully, tomorrow afternoon; I will try to remember a video.

It might also be worth mentioning, it was threaded through the drive train properly before my mate touched the RD. After, not so much.

Cheers