Challenge 1 claw bot

at first this is the first project, so majority of the robot making time is finding materials, although there are some challenge we are not able to complete at first. First the wheel, it keep disconnecting every time we start it so a better way we fix this problem is get a bunch of the black lock thingy and keep using on the first 2 wheel the last 2 doesnt matter. Second problem, the grabbing machine, every 2 and a half seccond the thing will fall apart, so we get a new motors  and restart the making process. Third the wiring and driving, It was inverted, so after some guessing and retrying we got it right, but it was a different cobtrol so we have to adapt to it. Well those are all the thing we overcome, now here a list of unethical thing we werent be able to fix. first the loose screw on the back. we have to ripped the entire thing off if we have to fix it but suck to suck its there now. seconds the screws, they are all in the incorrect size so they would someetime make the terrain roughy noise, but a minor inconvinece doenst matter:  the robot work. Driving skill, i was the one who always driving but since its a tank control ill never touch this thing again.