It has been some time since you have attempt to clean, or you gunked the this gun many times. If you have managed the extraction of the (what ever they call it) which it sounds like you have, Every thing should come apart. Spray some solvent on it. This a great shooter and a good value for the $$. I will never buy one again for this reason. The assembly is totaly BS. The amazing thing is Ruger has never addressed this problem. Oh I have over stated this, wait till you reassemble it.
Jim