1. Sew the fabric tunnel on on one side only and place over the plastic tube.
2. Using the enclosed wooden rod, push the fabric through the tube on the stitched side and your tunnel will be automatically turned.
The three sizes included in ths kit are:
S for tunnel widths from 9.5 mm to 16 mm,
M for tunnel widths from 19 mm to 25 mm
L for tunnel widths greater than 25 mm.