Vermeer BC1200XL Operator's Manual page 34

(9) Feed Roller Lock Bar
Fully raise and hold feed roller up with control lever. Install red lock
bar over cylinder rod as shown on controls side of machine and
secure with pin (A) as shown.
9
Raise feed roller, remove bar, and store as shown (photo below)
before resuming operation.
A
LEFT SIDE CONTROLS (OPTION)
20-12 Controls BC1200XL Brush Chipper