The gold nut is run through the 2x4 1x7 and 4x4. It's slightly counter set a little. Because the bolt is a little short. Also counter set the other side of the 4x4. The regular bolt is what holds the tire.
I counter set the backside of the 2x4 so that it fits behind without catching on the frame
By not doing this and using a washer it would be harder for the tire to pull out.
By making the second hole further up I could've got a little higher clearance. bottom hole 2" from the end with a 4" wheel next hole another 2" up changing it to 3 1/2". The hole in the frame is 4" off the ground
You could add more washers and not counter set for the backside of the wheel bolt
When using a spade bit for the counterset MAKE SURE you do the bigger hole first, then the smaller bit can go all the way through
I counter set the backside of the 2x4 so that it fits behind without catching on the frame
By not doing this and using a washer it would be harder for the tire to pull out.
By making the second hole further up I could've got a little higher clearance. bottom hole 2" from the end with a 4" wheel next hole another 2" up changing it to 3 1/2". The hole in the frame is 4" off the ground
You could add more washers and not counter set for the backside of the wheel bolt
When using a spade bit for the counterset MAKE SURE you do the bigger hole first, then the smaller bit can go all the way through
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