To change the music roll on the Wurlitzer 105 you should always work on a good surface so the flanges etc can't fall and be damages. To advance the music roll you will need to squeeze the "rewind pneumatic" Always vacuum out the tracker bar as shown when changing music rolls and remember that as the seasons of the year change you will have to loosen and tighten the nut on the music roll spool because of expansion and shrinking of the music roll paper
I hope the following pricures are useful. Also feel free to contact me with any questions.