[ Ref. Mike Walter in 201009 MMDigest ]

This is easy -- just get the spool box from any old pianola, cut it
in half, and place one half at each end of a lightly constructed table.
You will need handles for each end.  You can also have a continuous long
length of ladder chain joining both ends which can make it easier to
wind and rewind.  I buy an A1 size cutting board on eBay and then cut it
in half longways.

Another style is described in MMD:
https://www.mmdigest.com/Pictures/jphillips1.html 

These were for sale back in 2016 -- don't know if still available MMD
https://www.mmdigest.com/Archives/Digests/201602/2016.02.23.04.html 

There is an excellent video on repairing; however, please don't use
Scotch invisible tape.  Use Filmoplast P which is archival (both the
tape and the adhesive), it is also super thin so won't pucker-up the
roll and can be used on both sides if there is missing paper.
https://www.mmdigest.com/Archives/Digests/201602/2016.02.23.04.html 

Bruce Welch
Marrickville, NSW, Australia