Repair blind?

Hello,

We just got an Escape 191BH. Thus far, we like it very much. The blinds over the dinette slide up and down on strings that are tied down at the bottom to a clear plastic pieces attached to the wall on either side. To open and close, you just slide them up or down. Sometime over the last weekend trip, the string tied on the bottom right of the blind came undone and the string ends are (presumably) inside the bottom of the blind. There's a plastic plug on the bottom end of the blind where the strings should come out. I've tried to pull it off gently, to fish the strings out and re-tie it, but it doesn't move. Will I break anything too badly, if I yank it out with pliers to get the strings? Other thoughts about how to fix this?

Thanks for your time.