Repair needed: small section of liner off coping

Usually you can do it yourself, though it takes some arm strength, a warm sunny day, and some fiddling to get it to go fully back into the track. If you do get it back in, use liner lock, or some pennies, to wedge it into the track so it can't come out again.
 
Thanks. Its a very small section of liner - 8". My next question is, do I have to take off the section of top rail to do this (if so, i don't know how to do that). I've read that pouring boiling water on section of liner will allow liner to stretch.

I can provide pics, if necessary.
 
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