Is this an older or newer version of the 620 ? If it is an older model then I would purchase a box of LARGE black binder clips. I went the economical way and the Admin. Assistant at my job hooked me up with 10. I placed a LARGE binder clip on the 10, 30, 50, 30, and 10 yard line on BOTH sides of the board. That eliminated the crown. Remember this was done on an older version of the 620. Although I have the newer 620 I usually play on my older model. Fortunately I don't have any problems with my newer version of the 620. Hope this helps.
Coach J
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