Vinyl pool liner slipping in a spot

[BilldaCat]

New liner installed last year, just noticed this. It's not a huge slip. (you can see more of the light blue in the middle of the pic here).

Tried to briefly move it back in with my hands until I decided I didn't know I was doing and to do some more research. Reached out to the installer a few days ago, nothing back yet. What can I try without damaging the liner?

Thanks!

 

[Newdude]

It should zipper back into place. Massage it towards the middle near the area its still attached and the friction from you fingers should help make the liner more pliable. Work both sides and you'll eventually meet in the middle. For a mental image how it works, check the bottom of this Wiki

Liner Replacement - Further Reading

www.troublefreepool.com

Once it's back in, buy a 120 ft roll of liner lock for $25(ish) on Amazon. It's nothing but a rubber-y shim that keeps the liner hook from popping out from the track. Most of it presses in by hand. Use a scrap of wood and a rubber mallot if any of it is stubborn. The whole pool will take 15 mins and it's great insurance for future spots.