I have been rebuilding and hard-facing concaves for over 25 years and it has been my practice to leive all the wires in #1 concave( thrashing happens here) and remove everyother wire in # 2 & #3 concave. My customers are mainly corn & soy bean harvesters, and this set up works fine. If you have some wheet to harvest you can put 3 cover plates on- 2 on the front concave and 1 on the front of # 2. Be sure you have good square edges on your concave bars (1500 -1800 hours) or less to get a good thrash and a clean sample. If you have any questions you may call me any time. 765-891-1722 Thanks Donnie