Originally Posted by jamesd2021
In the event I can't find the back, is it bad to Leave it in the tube
It's definitely in there and they shouldn't cause an issue left in, but it will bounce about. And if you have to fit a new back in, then you will have to create a hole so getting the valve back out shouldn't be an issue.
I'd suggest getting it out, and roping in a helping hand in helping hold the fabric in place and helping work the valve towards where it should be!