I train on Zwift and have already built 7 seesaws for myself, teammates and friends. At first my seesaws only moved from side to side, but last fall I started to include back and forth movements. For this I used these cushions along with other details. These bearing blocks arrived quickly and looked fairly well made with no play on the bearing surfaces, properly spaced mounting holes etc. Long story short I built a prototype of the front and rear rocker platforms for myself to make sure all the parts were correct and details would work perfectly without any further problems and after about 1000 kilometers of testing everything worked great. Now I include them in all my swing platforms. These pads are reasonably priced and work very well in my application.