I had the same problem.. its a known production issue, and its being fixed.. I suggest doing what I did to get moving fast..

Problem solved, I picked up Part #274-1568 Size L Coaxial DC Power Plug at Radio Shack.. Barrel sized was 5.0mm O.D. x 2.5mm solder-type terminal they didn't carrier the screw type.. But it works fine.. for those that end up in the same situation.. cost $3.49

It was nice to have Morbeious resppnd with a solution but I would really like to have an answer from the manufacturer.

@castlephelps - You will want to use the "Contact Us" page to contact the manufacture. The forums here, while the EZ-Robot staff does monitor and respond it is not meant as way to resolver customer issues.

Several customers recently have come right to the forum over using Contact Us to contact the EZ-Robot staff directly. Why is that? Why did you use the forum vs. Contact Us? I'm just wondering if the "Contact Us" is buried on the site perhaps?

Good point / I actually clicked on Contact Us then Technical Support then Ask a Question and VIOLA I'm back in the forums / what am I doing wrong?

@castlephelps, looks like EZ Robot lets use here on the forum to be the first place to stop to overcome a problem. Usually you can get a quick answer to your problem and find a solution. Isn't that what you really want anyway?

If you need assistance straight from EZ Robot about a manufacture problem like the hardware not working properly or having something replaced that arrived broken or missing, in the Contact Us section click on the blue panel that says Product Warranty and you'll find an email form that will be sent straight to the company. It a holiday weekend so give them a little time to respond. IN the meantime take a trip to Radio Shack if you have one close and pick up the part that was suggested by Morbeious for a few bucks.

On the Contact Us page, select warranty, not tech support. You are not asking a tech support question, you are asking them to take care of a manufacturing defect.

Tech support questions are directed to the forum because the community here can answer most questions and there are users all over the world, so you get faster response then asking just EZ-Robot staff, but we can't order replacement parts for you.

Alan

Got it - thank you!

I just want to add. I too found that I have the same problem. The power plug does not fit. I am very disappointed.
Before someone posts that the forum is for technical issues and to use the Contact Us page. I have already used the contact page and at the same consider this to be a technical issue. Had I seen a post about this issue earlier this week I would have had a chance to go to my local RadioShack already and not had been caught off guard. Thank @castlephelps for your post. At least I am no alone in this. So how do I verify that I didn't get the wrong controller?