The bolts under the seat can be replaced. They're carriage bolts that
you can buy at well stocked hardware shops.
If you have a Fusion seat (the seat with a removable seat cover) you
can get to the bolts very easily. If you have a regular KH seat (the
seat cover is stapled to the base) then it will be a little bit more
difficult.
There are pictures of a disassembled KH Fusion seat in my 'Airseat
gallery' (http://gallery.unicyclist.com/Airseat). You can see the
carriage bolts and how they fit into the square holes in the seat base.
Carriage bolts have a square shoulder that keeps them from spinning in
a square hole.
Put in a replacement carriage bolt, put the seat back together and
you're all good. If you have a standard KH seat rather than the Fusion
seat then putting it back together will be a bit more difficult. No
need to glue the seat cover back to the foam. But you may need to
rubber cement or silicone type glue and staples to attach the underside
flap of the seat cover back to the base.
Something to check on your seat is to make sure that the acorn nuts are
not bottoming out on the bolts. The bolts on some seats can be a tad
too long and cause the acorn nuts to bottom out. Replace with deeper
acorn nuts or replace with open nuts or put a washer under the acorn
nut.
--
john_childs
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