2. Training wheels (x2)
The number of washers you need will depend on the thickness of your washer -- they are there to help your wheel spin, and also to make sure the screw fits snugly into the lock nut. Follow these steps for both training wheels.
2a. Training wheels
Add [washer(s) - wheel - washer(s)] to the bolt, so that there are washers on either side of the wheel.
2b. Training wheels
Screw on the training fork, making sure that the wheel is on the opposite side of the nub. Tighten on the locknut. The wheel should still spin freely -- if it doesn’t, remove some of your washers. You may need a screwdriver and pliers to tighten
3a. Front wheel
Screw the bolt into the front wheel slot. You may need a screwdriver to do this. The head of the bolt should be on the opposite side of the protruding top bar (the same side as the flat face), so the front and back wheel will align.
3b. Front wheel
Add [washer - wheel - washer] and the tighten on the lock nut. The wheel should still spin freely. If it does not, remove one or both of the washers. If there is too much room on the screw and the wheel wiggles, add another washer.
4a. Back wheel
Twist the training wheel with the open hole onto the long (1.75 or 2” screw) with the nub facing in and the wheel facing out as shown.
4b. Back wheel
Add the [lock washer - nut], then screw bolt into the bicycle frame. This training wheel should be on the opposite side of the protruding top bar, on the opposite side of the front wheel.
4c. Back wheel
Add [lock washer - nut - washer] as shown. Then add on the back wheel, with the pulley-side of the back wheel facing away from the frame.
4d. Back wheel
Add a [washer], then carefully tighten on the other training wheel by lightly pressing the opening of the nub against the end of the bolt. It should turn 3-5 times but can easily break if you apply too much pressure.
5. Finishing touches
It is pretty tricky to get those back wheels to stay in place. The easiest way to do it is to make sure the training wheels are aligned and touching the ground, the nut on the opposite side of the back wheel is tightened all the way up against the training wheel, and then use pliers to tighten the nut closest to the back wheel. Play around with it. Got a better system? Let us know!