Magura barke lever help?

So, I had to take my lever off the base bar and when I did the pin that gets pushed when the bolt is tightened came out and I can not find it. I have searched the floor but the thing is so small I think its lost.

My question is, is the pin something I can buy or am I screwed?

thanks

best bet would be contact magura. i havent found many replacement parts for the rt tt series.