Step 7: Making telescoping paper tube sleeves
I often need to make telescoping tubes that slide nicely in and out of each other. For this, I have made special forms that produce tubes just a hair bigger than what come off of my plain tube forms.
A sleeve-making form needs to be built up by gluing layers of kraft paper directly a plain form. I glue onto the new form however many number of layers I use to make tubes on the original form, plus one. This generally means four layers, and this has worked out well to produce tubes just bigger than the ones that come off of the original forms.
Sometimes I already have an existing tube that I'm going to use for something, like a mailing tube, and I need to just make a sleeve that fits over it. In this case, I'll cut off a section of the tube to create a form, and glue on one layer of kraft paper. This new form will produce tubes that work as sleeves for the original tube.
There is a bit of shrinkage that occurs, so don't fret if tubes and sleeves don't fit at first. Let them dry fully, and if things still don't fit, you can either add another layer to the form and try again, or add an additional layer to the smaller tube so it fits better in the sleeve.