The issue with your slow roll blackout shade not locking in the low position is often related to the spring tension or the catch mechanism failing to latch properly. You may need to replace the spring if adjusting the shade does not resolve the problem. To assist in ordering the correct replacement spring, measure the outside diameter of the aluminum roller tube—common sizes are 3/4", 1", and 1 1/4"—and also provide the width of the roller (not the spring). Elkhart RV Parts offers replacement springs compatible with your shade model. You can browse replacement springs, shade parts, and request free shade samples on our website. If you need detailed repair instructions, contacting the shade manufacturer or referring to the RV’s service manual may provide additional guidance. For further assistance, please contact Elkhart RV Parts with your measurements and model details to ensure you receive the correct parts.