Maintenance Should I replace a hot glued string in a large doll?

(This will eventually be a thread of me restringing dolls.)

When I got a certain large doll, his leg string was loose. Not "floppy", but loose, he could not stand. This is my first doll that is strung through the hip. I cut the string because it was WAY too long and there was hot glue covering the knots. But, now I am thinking of replacing the string because of the amount of hot glue that is left on. If I have to cut the string again, to get rid of ALL of the glue, it'll be too short to re-string him. I'm hoping that he uses the same string size as my mini dolls. I wish I photographed the knot before I cut it.

I wish I could pay someone to do it because I know nothing about hot glue. Do you think that there's a chance for that at the doll con? Should I join a meet up? I don't want to leave him as "incapable of sitting" due to being unstrung.
I don't know if I could zip tie the knots or something?? (Instead of using hot glue.) He's roughly 70cm. (One of my other 70cm+ might need re-stringing, but it's his through the neck and he's just floppy. Maybe he can wait another year?)

 

Thank you both. I have to admit, if it's superglue, then it's stronger than what I've been using as super glue. He's not sueded, but he will need that or some wire.

Since my mini doll is still unstrung, I compared the strings. Large doll's string is larger. Took the measurements [of both dolls, knowing that the string for the mini will now be 3mm] and it's looking like he might be 5mm in the legs. The arm string is maybe smaller.
I mean I could be mistaken and maybe he's 4mm for the legs, but I brought out my 4.0mm crochet hook and the cord's diameter looks larger than the hook, too. (I also tried marking some paper on both sides of his cord and measuring the distance. It came out to 6mm. Yeah, the outside of a pencil/pen was going to add bulk to the measurement.) I probably need to take a reference picture with the crochet hook.

Please note that my measurement of the diameter was NOT under tension / "under load".

I am thinking of temporarily stringing him with 3mm cord or some other string until I get the new cord.
To pick him up, I brace his one leg against my body, pull his string taught at his other leg, and balance his lower back and butt in my hand other hand at the same time. I need to find his other leg!