[detroitchild]

...it had a terrible crown and too many dead spots. I applied many of the recommended fixes but it became to frustrating so I went in another direction.

You may be able to get an older, better built 620 from one of the guys here for a good price. My recommendation (one of many different ones you can get on this forum), send the other one back and use that money to get one from one of the reputable guys here.