Watch this Video for how to do it:-
http://you.video.sina.com.cn/b/102350636-2028510075.html
Via: Sina Weibo (all in Chinese, aka "micro blog").
Wow, what a workmanship! :-o Now, all the Leica lenses of that user can be mounted directly without any adaptor needed.
Nonetheless, I think the use of a Leica-R to Pentax-K adaptor (widely available) is still preferable, which is simple, not destructive and most importantly, K-mount lenses can still be mounted and used, unless that user decided not to use any K-mount lenses on his Pentax DSLR anymore! :-(