Hangar 9 Extra 260 Assembly Manual page 18

Section 6 – Landing Gear Installation
  Step 5
Install a 4-40 blind nut into the hole from the inside
of the pant. The nut will be drawn into the plywood
later in this section.
  Step 6
Install the following items onto the axle: wheel pant,
3/16" wheel collar, wheel then another 3/16" wheel
collar. It will be necessary to fit the parts inside the
wheel pant and slide them onto the axle.
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  Step 7
Secure the pant in place using a 4-40 x 1/2" socket
head screw and #4 washer. Use threadlock on the
screw to prevent it from coming loose in flight.
  Step 8
Center the wheel in the wheel pant and tighten the
collars to prevent the wheel from moving side to side.
Use threadlock on both set screws.
 Step 9
Repeat Steps 3 through 8 for the remaining
wheel pant.