None of the standard fitting seats seem to stay fixed on our porcelain toilet bowl. On close examination the rims of the toilet are more narrow than usual and sloped. The toilet seat therefore tends to slip sideways. The bowl is newish, with no visible trademark. Anyone got any ideas.
The original seat may have been contoured to match the bowl.
I've found the big holding screws are undersize for the holes in the back of the toilet so cannot exercise any degree of control. Where they hold the toilet seat, it usually has a sliding arrangement to accomodate different widths between the holes so the slightest slackness allows the whole lot to start sliding.
I had some success once with providing the wingnuts with large washers and filling/packing the oversize holes in the porcelain proud with plastic padding screwing it up tight before it sets. The excess was extruded and formed a large area sound base for the large washers which were bonded to the porcelain just the right distance apart to keep the screws straight. This held until the WC was replaced.
I think your solution would work in many cases, but I've tested a standard seat , without even fixing it, It will NOT stay "seated" no matter how delicately one applies one's posterior.
Which means that the hinge parts must be moving. The holes in the bowl for the seat fixing bolts are normaly huge in comparison to the bolt diameter so don't offer a firm fix. Also there isn't much friction between the smooth plastic hinge and the glaze, try putting a bit of rubber glove (flat from the back or palm) under each hinge. Trim to size with a sharp knife after fitting.
I had the same problem! I saw a display model at Homebase that was the same make as the old one (which had given years of service) - but when I fitted it, found it was not very well made - it turned out to be "Made for Homebase" (not as displayed). The plastic boltheads were too small to retain the hinges in the tatty plastic adapters with slot holes and after a few days it slipped out of position. I fitted the bolts off the old one, which were much better - but the hinges are of poor design and sometimes also slip out of position. If it were any other product, I would have returned it for a refund!
On our upstairs toilet the rims are 5cm wide and flat. On our rogue downstairs toilet, the rims are just 3cm and have a slope inwards, the bowl is otherwise standard size!!
In "zappers" o.p. - he omitted to state that the bowl was standard size - hence my first post bit off the mark. Mike is now moving him in the right direction. My wood seat has the four radial pads plus a horizontal one at the furthest point from the hinges. This gives a greater surface area of contact which will reduce sideways slippage additionally. The back hinge fitting is somewhat sloppy but neither my wife nor myself have experienced any problems on our daily visit.
Hi thanx for learned advice, it turns out that tho' toilet seats may appear identically sized, in fact you should measure the distance between the two FRONT supporting pads these distances vary by up to
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