Yeah you just need to loosen the bolts, not take them out. See if you can gently put them back in. Because if the bottom half of that well seal falls in the well, you may never get anything out of that well. The well seal might be stuck to the casing a little, but the weight of the pump and pipe is really what holds it down. A come-along won't do it if there is 300' of galv pipe hanging down there.