Tap Internal Spline Worn and how to Repair? All aspects of plumbing questions and answers, help, tips and information

[coverhill]

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My house was built in 1914 and has many original and older features. The bath and taps is shown in the photo. I want to retain the taps and faucet but the internal spline of the cold tap has worn so that it no longer grips. If I substitute the hot tap handle there is no problem with opening the valve. Any advice please about what I can do about the internal spine of the cold tap please?

[KitchenGuy]

It is a difficult job to do the repair you ask. It usually involves turning it down and fitting a splined sleeve over the top or a similar engineering solution. It would be easier to drill the head, thread and insert a grub screw.

All is not lost, if you want to do a bit of looking round you can replace the whole tap valve, stem and washer as one unit, it simply screws in and out. I have seen imperial ones on my travels so they are about. It looks something like the ones on this page.
https://www.notjusttaps.co.uk/tap-valves-washer-compression.html
Good luck