Well I have a fat bowl of very dried out mimosa root bark that had been sitting in a glass bowl for the past 4 months. I wasn't able to pull everything I wanted from the batch because I ran out of naptha. Now that I have more naptha I thought I might try getting the rest out of the bark, so I was wondering how exactly I'd go about doing this? Would I need to do all the steps over again (including mixing the bark with h2o, vinegar, lime), or just add naptha and pull? Is it even worth trying to get the rest?

I would think that if it has already been basified, then no - although I could very well be entirely wrong about that.

Just do a pull and if you get anything then it works, if not just re-A/B or whatever you did. If you still don't get anything then there probably isn't any to be got!

I agree with previous pOster. You should be able to pick up where you left off- I've seen it work a few times with 2-3 month old basified bark