Adjustable roller shade

A method of adjusting length of a roller shade assembly, the roller shade assembly comprising:

• a tubular roller having a generally cylindrical internal cavity;
• a tubular extension telescopically mounted within the internal cavity of the tubular roller, an end of the tubular extension being disposed outside the internal cavity, wherein the extension comprises an outer wall and a plurality of winged splines located around the outer circumference of the outer wall and which extend along at least a portion of the length of the extension;
• and
• an outer tube mounted over the extension, the method comprising the steps of:
• cutting the extension to a length which results in desired total length of the roller shade assembly;
• and
• sliding the tubular extension into the internal cavity of the tubular roller until the end of the tubular extension is flush with an end of the extension.