How would you guys to bend pvc conduit 20mm&25mm with spring to create 3 saddle bend or four saddle bend? Not like a simple 90 degree bends. Is there any formula or tricks or any steps you guys would do? Because I used the app to calculate the distance to bend but end up too close each bend and impossible with my knee. I think the app I use if for bend EMT with bender. So any recommendations? Thanks