I thought it was only me!!
My last wooden seat lasted ten years, and finally split last December (2006). It just gave out on the joint between pieces glued together. I bought a acrylic resin one, a funky one at the kids request, and in under 6 mths the screw fixings had snapped and broken off. I've tried all sorts to fix it, and even asked about my money back, but because I'd paid cash, and hadn't kept receipt (who knew I'd need it?), I'm stuck with it.
My kids and I have developed the 'gingerly down' method, in case it slides away from under us. I would buy another one, but I'm on a tight budget and don't want to waste more money on a similar problem.
I can't believe that manufacturers haven't sorted these fixings out. They are impossible to get inline when your head is stuck behind the U-bend aren't they?
Have you tried the plastic fixings ones? Do they last any longer?
Good luck mate, and be comforted that you are not alone, we all have been there.
PS; Is it only me who has the Paul Simon song 'Slip sliding away' come to mind when in this delicate situation?
I've just read Yogi and I TOTALLY AGREE. Expensive ones are just as bad!!!