May have a high point in compression area of cylinder . Difficult to see but I can feel a sticking point when inserting piston and seal at one place within cylinder compression area.

I've just spotted these brake cylinder hones and they arnt a lot of money.
It's only an air pistol cylinder so not a long reach either. Has anyone experiance of these and do you thing it's a appropriate too for such a job .

Or has anyone any other suggestions before I try obtain a replacement cylinder .
Thanks