Another stuck one!!

The left side came off so easily, because up until i tried pulling the left zerk out and broke it off (I thought maybe the lower part of the zerk was binding up the rod), it has been lubed regularaly, so the spline didnt rust. Not the right side =(

If asnyone has one of these arms laying around and would ship it to me via media mail (the cheapest), I'll just cut the damn thing in 2 and that should get it off, but I dont wanna do that just yet.
Any advice would be truly appreciated.
Thanks for helping me out guys, without you I'd have slapped some c4 on this baby a long time ago =P

How do I tell the difference between cast iron/steel. I kinda thought they were the same thing,, well not the same, but i just figured it was cast iron, just like alot of the other things.

I'm not a metalorgist or machinst, so dont beat me up too bad =)

Steel sparks will be yellow to orange and usually incandess longer on their way to the floor.

Get some old metal scraps and grind them to get an idea. I don't recommend that you use your mother's cast iron frying pan. Use an old water pump or something similar. Do it inside or in the shade for a better look.

Don't assume that any bulky or molded ferrous item is cast. You should google on forged steel to get an idea of the process. Cast iron is very stable after it has been aged for awhile. However, it has nowhere near the strenght of the cheapest steel.

Steel is rarely cast. Stainless steel is more likely to be cast using lost wax investment molds. You see alot of that stuff in marine applications

I can't see how a carbon arc is going to match a rosebud torch. Yes, I know that the furnaces in steel mills are electric arc heated. Are you borrowing one of those yet from the sister's boyfriend? A good rosebud will heat the whole area to a uniform bright orange in about 4-5 minutes. Your carbon arc will never do that and I haven't even seen it yet. You will always have "cold spots" you cannot reach.

If you haven't got an air arc, put an abrasive wheel in a die grinder, hand grinder, or saw. You could also use a sawsall. You'd be surprised at how much stuff gets cut and rewelded when millwrights start doing maintenance.

However, if that doesn't appeal to you, use some of your welding equipment. It doesn't sound like you have oxy-acet torch. That would certainly do the job. Forget the ice cubes.

But you do have a carbon arc. Does that include an air-arc? Slice thru the top of the arm down to the splines. Drive a thin wedge in the kerf and the arm will slide off. Repair the arm with weld and grind. Nobody will know the difference particularly if the cut is on the bottom. I use rock spliting wedges because they have a gentle taper. An old screwdriver would also work. Drive it parallel to shaft.