Used the original design from OceanHikerMike to great effect for about 100 dives last year but it broke where the cap meets the axle. I increased the outer diameter of the axle by 4mm while keeping the inner diameter the same. In theory is should be more durable.

While it reduces the overall reel capacity, my line never filled the original so not an issue for me as a recreational non-cave, non-wreck diver.