A rare video of Chuck Lande has been posted on YouTube.  Chuck is frequently credited as being the original 2-handed PBA bowler.  This video is from 1987.  It is fascinating to watch and see that the mechanics of 2-handed bowling which we have become accustomed to seeing regularly these days is not that different from what Chuck Lande was doing 33 years ago.

https://www.youtube.com/watch?v=BkmZLgM5bsM&feature=emb_title

that's amazing, same basic mechanics, doesn't have the hop step though.
he sure was banging on it at the bottom too