Artist Unknown Monument 450p D.I.Y. Tap Reseating Tool, Multi (MON450)

It did the trick, just as advertised. It's now part of my tool box.

A bathroom tap began to drip as it was seldom tightened enough, and water between the copper and the washer had scored a channel in the valve seat that needed fixing. I also took the opportunity to convert the tap to a ceramic 1/4-turn mechanism while repairing the valve seat (TapMagician sells internals). Just like the previous washer, the base of a ceramic cartridge needs a good valve seat to seal itself against.After buying this, it took a while for me to pluck up the courage to actually do the job since it's a one-way process and I wanted to be sure there were no tricks I should be aware of. There are plenty of cheerful guides to the process on Youtube that encouraged me to have a go and I eventually got it done. The hardest part may actually be disassembling the tap if it has been left to its own devices for too long and everything is scaled up or it was overtightened in the past, but once the mechanism is out it's a doddle to do the grinding down part. The red collars (or yellow as shown in Amazon's image) have various sized threads that fit various tap types, and the three grinding faces also suit varying sizes of valve seats; with experience or a bit of trial and error you find the right ones and assemble the tool to do the job. I'd worried that the process would be hard to do because I'd need to keep the grinding tool flat to the valve seat, but of course the tool screws into the tap and sorts that out for me! It really is a case of getting the right tools for the job and making it look easy, and this was definitely the right one for me. It's also a damn sight cheaper than a plumber and now, after the abolition of slavery, you're no longer allowed to re-sell plumbers on Ebay anyway.

I liked the simplicity and convenience of the task. It is hard to believe it really. (As I frequently find small useful devices like this are becoming harder and harder to find locally - so you visit three shops unsuccessfully and finally order it from Good Old Amazon.) I READ THE first 5 star review and he was absolutely right! Bought the device, used it, took me 10 minutes at the most and at long last have a non-dripping tap! ABSOLUTELY DELIGHTED.

I messed about for years replacing washers every few months on leaky bathroom taps in a fifty-year-old house. Finally realised that the tap seat was corroded and worn: after regrinding the seats with this brilliant tool I haven't had to change a washer since.So if your tap keeps leaking despite changing the washer: it's not the washer, it's the seat. Get one of these.

I had three cold water taps that have been dripping badly for ages. The taps are 25 years old and the seats onto which the washers press down were badly corroded. My family had been complaining for ages and I had changed the washers many times, but this only reduced the dripping, rather than stopped it altogether.With this tap reseating tool, I was able to grind the seats down to give a nice smooth surface for the washers to press against. It took quite a long time before I could no longer see any channels in the metal surface for the water to escape through. (Use a torch and a magnifying glass to check.) If there are any imperfections in the surface, the water will find its way through and eventually enlarge the defect into a new channel and you're back to square one.Once done, I fitted new washers, reassembled the taps and turned the water back on - no more drips and no need to apply a tremendous torque to turn the taps off.Tip: The tool leaves lots of metal shavings in the tap. You don't want these to get stuck in the new washers, so to avoid this, leave the reassembled taps in the (half) on position before turning the mains water back on. This way, the flow flushes the shavings out before the washer is pressed against the new metal surface to turn the tap off, thereby trapping the shavings. Also, check any water for shavings before drinking it.I've now oiled the cutters with WD40 to prevent rusting and put the tool away since I'll probably need it again in 25 years time.

Finally got an increasingly badly tap sorted out with this, having not used one before either. Though you can maybe feel a notch worn in the metal with your finger, or find it with the aid of a torch, it was really apparent after using this initially - The unworn rim is bright metal whereas the groove will still be tarnished until you level it all out.Took a good few unscrewings and checks before it was all level, though this will depend on the particular tap, obviously.This might also be obvious but it's worth checking that you can actually get the tap open before you invest - A second, just dripping, one wouldn't budge for me so this would have gone to waste in that case.Finally, unlike a lot of stuff online, it's actually sturdier than it looks in the photos - Very good quality.