As you know, the standard windlass of the 310 has only a capstan (drum) and no gypsy (chainwheel) and the kit to modify the VC500 to a VW500 is no longer available. So with the idea of doing some extended cruising, I just purchased and installed a new Maxwell VW 500 windlass with a chain wheel (gypsy) . The footprint of the shaft (spacer) tube is the same as that of the VC500 (with some important caveats) but the VC500 has 4 studs and the VW500 has only 3. I had to fill the old holes and drill the new ones. That was not very difficult. The hard part was installing what's called the the "collar" (a #!?*%@*# split ring plastic retaining washer); a very long story. Otherwise it was "fairly" straightforward. However, there are a lot of little details that I have learned that would save an would be installer a lot of time. The manual is woefully inadequate and even has some errors. I discovered this by contacting Maxwell. They (Will Vrooman) were very helpful and knowledgeable. If you are considering installing the VW500, let me know & I will give you a lot of very useful hints.
Jeff
Jeff