Pneumatic Cylinder damage

[somenerd]

Our team was experimenting with two pneumatic cylinders. We made a rookie mistake and champed too hard on the pneumatic cylinders, and now they both have a slight kink inside; No outside visible damage, but you can feel a slight indentation or bump when pulling the piston out and in.
We tested them (with no load) after we realized our mistake, and they still worked. We weren't planning on using these on the robot, and our mentors think they should still be usable.
Next meeting, we are going to check the actual force provided by the cylinders to see how its performance in terms of force has been affected. I would like to know of anything we should look out for.
Thanks.
BTW, would connecting the cylinders to a pneumatics system (compressor, dump value, air tank, etc) and filling it to a high PSI force the cylinder back into shape? Or would it exacerbate the problem?