Thought I'd pass along this 3D print file. Seems the umbrella sleeve/anchors manufactures don't do a lot of market research before they design their products. 
This file adapts a 1-1/4" umbrella pole to the most common 2-5/8" deck sleeve:
Pool Sun Ledge Umbrella Adapter by glenmcgowan
This file adapts a 1-1/4" umbrella pole to the most common 2-5/8" deck sleeve:
Pool Sun Ledge Umbrella Adapter by glenmcgowan
