I have just got around to fixing a bristan 1901 handbasin tap (hot) that has been getting increasingly hard to turn off. The old washer was brittle and half worn through, the seat looked OK, but i polished it with a seating tool just to make sure, no apparent erosion. When it came to replacing the washer, I found that none of the new 3/4" washers that I have fit very well - in other words they have a central hole that is too big to fit snugly on the washer lug - I searched around for some older washers and they were as bad - basically the washers weren't even tight enough on the lug to stay in place while the tap valve assembly was turned right way up to screw it in. It was possible to put the washer centered on the seat and then offer up the valve assembly and get the washer seated that way. The upshot is that the tap works fine, except it really does need to be firmly tightened - the main reason that I had a go at the tap was that my elderly mother wasn't strong enough to turn it on when its so tightly done up. What I want to know is: a) is it common for washers to be a very loose fit on the lug - so loose that they fall off? - anything that cann be done about it? b) should Bristan 1901 taps be that hard to shut? - is there any trick to make them work more lightly? thanks in advance.