Hello, I'm Dan from JOY Property Services.
We have been trading for 5yrs as JOY with over 25yrs experience covering all aspects of Carpentry & Building.
Ensure that all areas are clean and free of any possible scale build up.
you could try a little lubricant before pushing in place. wd40 would be fine. once all together wipe access away.
It really depends on the size if the area.
at a guess based on an average size hall i would charge £320 labour cost. based on one and a half days labour.