Having started to clean the outside of my CI bath for repainting, the
amount of muck around the feet and the fact they were slack lead me
into trying take them off. The first bolt came off OK but the other
three are rusted such that the heads are turning and they will require
to be cut off. The one that did come off shows the bolt to have a
special shape - anyone know anything about the history of these, if
they are standard and if these are available anywhere?

Rob