[O.B.Left]

Thats a great question. One that demands perhaps an in person lesson. But I answer now because I am struck by how fortunate your friend is to be strong on his left leg and weak with his left arm ........from a TGM perspective. Its a good fit I believe.

If you watch Lynn Blakes swing with a mid iron , you'll see a man who has shuttled his weight onto his left side via a pre positioned slide of the hips with a centered head. He stays pretty much left to my eye. But given physical limitations there is nothing wrong with staying very left......its a school of thought these days as you probably know... Tiger is starting to do it himself.

As for the weak left arm ......Lynn has a great story about Gene Littler winning on tour after having much of the muscles removed from his left arm and side due to cancer..... He won prior to being able to lift his left arm above his shoulder on its own. When asked how he could achieve such a feat his response was something to the effect that "I never knew how much I didnt need my left arm". This ties in especially well with TGM given its "rope like" left arm and EXTENSOR ACTION. Try the search function for this term its a must for your friend given his limitations and Id say a must for any other golfer frankly.