[Boatanchors] [Milsurplus] Rusted parts help?

[WA5CAB--- via Boatanchors]

Wayne,

What are the two shafts made of?  Some of the solutions offered work only 
on specific metals (iron and steel, for example).

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 06/06/2014 15:35:42 PM Central Daylight Time, 
k2gkk at hotmail.com writes: 
> At 02:21 PM 6/6/2014, hwhall at compuserve.com wrote:
> >One of the WWII restoration projects at the museum is a bunch of large 
> impulse driven (slave) clocks we wish to return to operation (I've gotten a 
> couple running so far) . The problem we have that I hope you all can help 
> solve is that many of the concentric shafts for the minute hand and hour hand 
> are seized (i.e., solid minute hand shaft inside tubular hour shaft). The 
> shafts are concentric for about two inches length, with about 3/8 inch 
> overall outside dia. The two shafts were a very close fit originally and are 
> now pretty solidly stuck.
> >
> >I've tried Liquid Wrench but it doesn't seem to be able to penetrate. 
> I've tried placing the assembly in my zero-deg freezer for a couple days &then 
> hitting the outer hour shaft with a propane flame for several seconds, 
> then tapping on the inner shaft. So far, nothing gives. I can't hammer very 
> hard, the rest of the assembly won't take the abuse.
> >
> >Is there something that penetrates better than Liquid Wrench? If no, then 
> I think my next attack will require packing one end of the inner shaft in 
> dry ice with the flame applied to the outer shaft, in the hope that the 
> reason it failed before was the inner took heat from the outer too quickly.
> >
> >Any other ideas??
> >
> >Thanks!
> >
> >Wayne
> >WB4OGM