How do I remove the tap arm?
I donât think you can remove any of that without removing the whole tap from the sink. This you do from below with a special tool you can get in the hardware stores.
The top lever on the âballâ may be detachable if there is a small screw at the back but I wouldnât do that without taking the whole tap off. Make sure to cut off the water feedsâŠ
This is the kind of tool you need
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There are different types of fittings, some with visible fasteners, some not. Sometimes they may be disguised behind the hot/cold (or red/blue) indicator which may need to be prised off. I donât see any such here though, and Iâm assuming that if a screw were visible the question would not have been asked.
As for the special tool - Iâve fitted, removed, refitted, replaced many taps of various types over the years, into the dozens at least, and have never used such a thing. And if you are thinking of removing the whole tap you will need a lot of other tools and know-now anyway.
Certainly nothing to prise off from this side, maybe if you took a photo from the top?
screw might be hidden at the back. put the tap in closed position and look.
It is on mine. Canât turn it enough to look inside but I think it needs an Allen key (inbuss, here).
True. All the ones Iâve seen take an Allen wrench.
There is something at the back lower down near the sink which looks like a screw. But its pretty inaccessible. The arm is stiff to use so I wanted to spray lubricant inside to loosen it up.
Might be a build up of limescale in the tap
Just replace it. That is what a plumber would do.
Yes most likely. I already had to have one replaced because it got so stiff to use.
The point is to use it regularly and because you probably wonât as the position is just perfect for you (same here) move it back and forth regularly just for the sake of it.
I have the same problem and after reading your post today I checked and it went kind of hard again.
I covered it in Potz antichalk (lime, limestone, scale ⊠lets not start that discussion again 
) which of course seems useless at first sight but isnât. Some of it always goes in. So I soaked it, moved the tap arm loads of times, went away, did it again ⊠repeat.
By the evening it went smoothly again. Give it a try, I hate how they just replace these things when it could be taken apart, cleaned (entkalkt) and put together again. If you do take it apart replace the seals while youâre at it.