The 172 wing with strut has more flex than the 177 without strut . That flex can be hazardous to the windscreen if someone has pumped too much silicone into the gap . Usually a small sealing bead is in front of felt to give a nice seal . If the felt was removed and just pure sealant used . A dangerous condition can occur .Recovering from a spin in just such a siliconed mess , I lost half the windscreen . I couldn’t get the aircraft to stop phugoid oscillations when slowing down , but still had some pitch control above 90 knots . So that was the first time I had landed a 172 at 90 knots . Fully expecting to go off the end into the fence , but the drag from the missing top of the window slowed the plane down and I got it stopped before the end of the runway . Good times
Never spun a Cardinal .