6600 concave won't close completely
Hello, I was trying to adjust the concave on my 6601 as per the manual. It says to close it completely but when I do there is still about a half inch between the front concave bars and the rasp bars. The rear adjust okay as with the two adjusting bolts on the sides. I can close the rear completely with those. I see that the front is adjusted on a 7/8" square bar driving a cam type unit on each side. I must be missing something but I don't see any way to adjust that. Maybe something is bent? It does a decent job as is but would like to be able to crank it down tighter than a half inch on the front. Specs are half inch on front, quarter inch on back is setting two on the dial. Any harm in cranking the rear down tighter if I can't get the front down too - say half on the front and eight inch on the back? Thanks in advance.