i said i would report back when i asked the question regarding why my chaffer sieve was breaking near the adjusters at the back. On investigation we found qiute a few 2188 and 2388 were breaking the sieve in the same place. We found that the sieve box was just hitting on the back axle mount and the combines that weren't breaking theirs had an exta spacer put in on both sides to hold the axle mount back about 20mm so there is more clearance for the sieve box underneath. I was wondering if any other people have found this problem??