When replacing a roller shade clutch, follow these steps to insure good fit and function. First, measure the outside diameter of the roller tube:
Next, compare the existing clutch visually, then compare the sizes and the roller tube size to the description listed for the new clutch:
Take note of any splines or indentations in the interior of the roller tube that might interfere with the shaft of the roller shade clutch, like these:
If the tube has those, a clutch that accommodates those will be needed, like this:
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