One traditonal (Pegler) tap in the house has to be turned several times then stops solid, with only a drip to show for it. Seems to happen when visitors shut tap down (we close it gently to stop this repeating.) First time I replaced the washer, on further occurences I removed the headgear and found the jumper seems to be in slightly different positions each time. Can I lock the jumper? Is there any advice, as this tap is only 2 years old. Others of the same type, replaced at the same time are perfect. Any advice on reassembling new head gear to stop this?