At a hardware store, (like Lowe's or Home Depot), purchase 1/2"
long plastic, white, standoffs. Also, take a screw from the RV and match it up
with one like it, except 1/2" longer.
Replace the existing screw with the longer screw and place the standoff between
the bobbin and the wall to stand the bobbin off 1/2".
It looks good and provides clearance so the shades slide up and down without
hitting the window-opening wheel. It’s made opening my shades a shade easier.