Solid Liquid Paper

My wife's solid liquid paper applicator got all dicombooberated, so she asked me to take a look at it. It wasn't too bad, a little tedious winding the tape back on the spool. A lot of willy twicky engineering went into this little gizmo. The small feed spool is a friction fit on it's hub, which is part of the larger diameter take up spool. So dragging the fresh tape off the feed spool causes the take up spool to try and pull more tape than is getting let out, which keeps tension on the tape. So you need just the right fit, so you get just the right amount of friction. Which means the molds need to be just right, probably to the nearest ten-thousandth of an inch.