That sounds like the best plan
you have to take the cistern off the wall to do it. this is usually difficult because you find the screws have rusted into position and they are hard to get to and their heads have rounded off, and you can't cut off the water to the cistern.
So it would be worth buying a few stainless screw to put it back with, and a service valve as well for the supply pipe. I like the flexible braided connectors with valve incorporated, but some say that they can fail if at mains pressure.
If you are going to the trouble of taking the cistern off, make sure your syphon is in good condition, if not fit a new one to save having to take the cistern off again in the near future.
I am just a householder.
you have to take the cistern off the wall to do it. this is usually difficult because you find the screws have rusted into position and they are hard to get to and their heads have rounded off, and you can't cut off the water to the cistern.
So it would be worth buying a few stainless screw to put it back with, and a service valve as well for the supply pipe. I like the flexible braided connectors with valve incorporated, but some say that they can fail if at mains pressure.
If you are going to the trouble of taking the cistern off, make sure your syphon is in good condition, if not fit a new one to save having to take the cistern off again in the near future.
I am just a householder.