razer black widow 2016 - broken fixing pin?

hello, I own a Razer ultimate edition 2016 and a few weeks ago I started having problems pressing some keys. In particular the problems are with the central letters, ie y t b g ... I decided to remove the keys and clean everything and already after removing them I notice that a white fixing pin is missing just near the y. I decided to remove the whole keyboard and confirmed my problem. How can I solve? I attach a photo because the term fixing pin I do not know if it is correct and I do not have an adequate translation. thank you