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There has to be either a nut and washer under the toilet, or if its reversed a bolt head with a washer under it holding it down. To remove it you can either use a hacksaw blade between the bowl and the bottom of the seat. Or use a dremel tool to slowly cut away the metal rod, etc., from the top. If using hacksaw put down some masking tape on the bowl so you don't scar up the enamel surfacr of the bowl. Work slowly and you will eventulaly cut through it.
If the bolts are plastic or metal you will need to cut them off and install new ones from new seat or bolt kit there is no easy trick its just an easy cut them off or you could try some wd-40 or nutbuster.
Removing toilet seat hardware can be a problem, especially as it is prone to corrosion - but it can be done. You can attach a pair of gripping pliers to the nut, apply thread lubricant, and unscrew the bolt from the top OR you can use one of those blade-and-handle hacksaws to cut off the nut OR you can use that little hacksaw to cut off enough excess bolt length to allow a socket to engage the nut and allow the bolt to be removed from the top.
If the screws won't turn either way, they're probably "cross-threaded" or stripped. You'll have to unscrew them with force. I'd use a ratchet and socket on an extension (you might want to use a deep socket, since the bolts often extend an inch or two past the nut).
Once you get them off & can remove the seat, head to the hardware store or Home Depot & pick up a new set of bolts & nuts. They're very inexpensive. When installing them, make sure that the nuts screw onto the bolts with finger pressure alone, before taking a wrench or pliers to them.
If using force to unscrew them ends up damaging the toilet lid/seat assembly (this is the worst-case scenario), then you'll have to spring for a new toilet seat. The up-side of this is that new seat/lid assembly come with the screws and nuts, and - depending on what you want - can cost as little as $15 for an "economy" model, and up to $30-35 or so for a "deluxe" model.
I just had the same problem.I can not believe that kohler would design such a flaw. I have four of these toilets in my house,and it would be ridiculously expensive to replace, especially for a seat. To fix it I went to OSH and got some 1/4-20 T nuts, went home cut the bolts off the seat (multi master dremel) with metal cutting blade. With a screw driver tapped the bolt and the small area around the bolt down into the toilet area. Now you have just a porcelain hole. Clean area with solvent (lacquer thinner),get some gel type super glue from hobby shop and put it on inside and top edge of the hole on the toilet. Put some glue around the shaft and under side of the T nut and slip it into the hole.Then put a SMALL bead of glue around where the T nut makes contact with toilet and let it dry aprox 1/2 hour. Now you have a permanent fix.To prevent a problem getting the bolt out in the future,put some anti seize (auto part store) on the threads of the new bolts. Hope this helps. Good luck Max
A standard toilet seat bolt should be fine. There are some with a rubber boot that expands as tightened but you should be able to reach the nut by reaching into the tank and under the lip. The new nut & bolt should be plastic so they won't corrode.
Here's what I did. Unscrew them as much as possible. Then I used a bolt cutter and hacksaw to cut away as much of the plastic seat holders as possible. I could then remove most of the seat, and get better access to the screws. I then raised the loose screws enough to cut them with a bolt cutter. Soft screws cut easily. The screw heads are now out. Now, tap down on the screw/anchor and it falls into the bowl. It will stay there. The remaining problem is that you need anchors to secure the new toilet seat. Kohler wants $50. I have a usable but loose seat. Never again-Kohler.
I strongly recommend using a boltcutter. A hacksaw will tear up the bowl.