You are correct.  There are 2 tabs where you think.  You just have to stick a couple of screwdrivers in and keep trying until you find it. I am sure there is a correct method, but I sure can't figure it out. I have had ours open 3 times and replaced the belt this week.  It looks to me like it would be OK even if the tabs were gone because the 5 screws would surely hold it together.  Actually, I only have 2 remaining.
                 Jon
                
 November 2004