40ups have real cheap aluminum spools. They use to make them with galvanized spools, which were great and you could hand those tiups down to your kids. The aluminum spools bend easily, esp the the tab that trips the flag. Don't take much bending to break those tabs off.
I have 45 40ups and 15 of them I hate b/c of the aluminum spool. Next year I will probably swap those spools out for the big plastic ones.