Joined: Oct 2016
Posts: 854
Likes: 334
From: Cambridge UK
Bikes: 1903 24 spd Sunbeam, 1927 Humber, 3 1930 Raleighs, 2 1940s Sunbeams, 2 1940s Raleighs, Rudge, 1950s Robin Hood, 1958 Claud Butler, 2 1973 Colnago Supers, Eddie Merckx, 2 1980 Holdsworth, EG Bates funny TT bike, another 6 or so 1990s bikes
Errrh ....just a thought. From the foto it looks like the crank is kaput. The hole at the base of the crank where the spindle rests appears to be badly eccentric. It is supposed to be perfectly round and a tight fit on the spindle prior to being secured by a cotter pin. Hopefully it is a optical illusion but it appears to be badly worn and no amount of chain-ring straightening will fix that.