Shower drain rusted unable to remove, help.
I've looked at the WingTite shower drain instructions and they seem pretty much clear. Before I proceed I would like to know if these steps will work on my drain because before I found their website I tried to remove the drain by gaining access from the bottom of the shower and could not. I found there is corrosion around the existing drain retaining nut making it impossible to come off from below. So my question to you is do I have to worry about the existing retaining nut not coming off since it is corrorded before I can install the new WingTite drain following their instructions? Their instructions say that the "remaining shower drain body will collapse allowing retaining nut below base to drop. Nut stays below". If it is rusted will it drop as they say in their instructions? I appreciate any advise you can offer. Thanks in advance.
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Speedball1 - Thanks for your reply. Tried as you described but still unable to remove the brass drain body as outlined in WingTite's instructions. As previously mentioned what I observed from below there is rusted corrosion do you believe this could be prohibiting the drain body from collapsing? And by this being a brass fixture I could not get it to squeeze together as in figure 3e, what do you suggest?