There are seven widths of R-Bar and eight S-Bars. The sliver XXW is not available in the R-Bar.
|XXW (S-Bar only)||XW/XXW||XW||W/XW|
Step 1: Use the hex key to remove the 2 screws at the front of each panel.
Step 2: Slide the panel off the point of the tree.
Step 3: Unscrew all 4 bolts in the gullet bar and remove the gullet bar.
Step 4: Insert different width of gullet bar. Insert all 4 bolts by hand then secure.