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wheels not touching ground
A lot of teams will see that when their base got welded together, or somehow bolted together, the resulting base become bent sometime during the process, making the wheels not touching the ground.
A quick way to fix it is to remove the wheels, put the base on the ground, and use a soft mallet and hammer it flat. We have been doing that for a couple of years, and the base always came out really well. Just make sure you are hammering with controlled hits.
The other way, or course, is the lift up the height of brackets or wheel mounts to make sure the wheels touch, but you probabmy want to hammer you base a little bit to get good straight surface on it to mount your components correctly. If the base isn't flat, then you will see that legs of components won't completely lay flat on the base, which means you will need ways to stack up washers or whatever you can find under those components for a solid connection.
Bottom line, try to get you base flat and in good shape before you start attaching components on it.
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