Most small 4-1/2” mini paint rollers are packaged very tight. When you first try to use them two sides are flat, not good for rolling. Store them inside toilet paper cardboard tube and it makes them perfectly round. Store them vertically will prevent crushing or use 1-1/2” schedule 40 pvc.
Prescriptive codes don't address the connection at less common angles, so base the connection off more typical ones using bolts, structural screws, blocking, and steel tension ties.
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