i've never had any trouble getting
an agitator nut off any of my rollermatics, yet. and i have done four so far, two to go.
i always put a good vice grips at the bottom most part of the agitator shadft, right above the ball coupler. i then put a hollow steel tube over the vice grip handle to keep that vice grip from moving back and forth as i loosen the nut. they have all come right off.
i did not like the idea of simply holding the tub with my foot etc. that i have read from old frigidaire repairmen. because that keyway can break off with all that stress on it from trying to turn that nut while using the tub to hold the agitator shaft from turning. a vice grips works well. i did buy a new pair just for that use, the biggest, heaviest i could find.
one of my rollermatics is the exact model as yours. at this point i do not have an agitator i can part with but i may in the future. the tub on this one is extremely disintigrated to the point of being unusable. if i find another tub i would like to restore it and hence would keep the agitator. if i decide to simply use it as a parts machine then i could let the agitator go. it all boils down to if i can find a tub and i won't really be working on it till next year, have 3 others ahead of it.
i know this doesn't help you now but i do know someone that has frigidaire parts. i just bought parts from mark michaels who found a source himself. he says this guy has tons of stuff left. i bought 5 water seals, a tub support, 3 oil bellows and one water bellows. and an agitate arm ball kit.
mark has one more water bellows left, he is planning on selling it on e bay. i don't need any more. i have plenty now. i also think dave on the web under dave's repair.com
might have water bellows left, he too might have an agitator. i have bought from him before.
and then is always train guy if you can get ahold of him, he's a tough one to communicate with but seems nice.
i would start with mark michaels. his e mail is
[email protected] and i spoke with him last nite via phone.
once you get that nut off you might be able to fix that agitator. i did buy a cone from mark, but it is the second cone, the middle cone. i know he has more of those, he wanted me to buy them. if you need that i do have it. i was gonna make a decoration out of it.
good luck, i would get that nut off and then see what the damage to the agitator is, you may luck out!