Which type of 6" H&L discs for my rusty frame?

[Tim B.]

Lots of nooks and crannies on the inside of the frame to reach. Mike V's suggestion allows for flexible access to difficult areas without damaging your sander's pad and wasting sandpaper since you won't be flat sanding. An inexpensive 4" angle grinder using assorted knotted wire wheel shapes (instead of the disc) and an electric drill with assorted smaller wire wheel shapes and extensions will get you into most areas and will leave the metal with a clean burnished surface. Tim