When you buy the complete kit via mjmods.com, here's a summary of the addtional work required by you:
1) drill 3/8" hole into provided shroud for the prop stopper
2) cut short piece of the provided acryllic rod to be used as prop stopper
3) superglue prop stopper into hole drilled
4) cut provided stainless steel shaft to size
5) cut provided hard & soft tubing to size
6) figure out best location for the prop, so that prop will spin without hitting the prop stop when going the correct location, but will hit the prop stop if starts out the wrong direction.
7) superglue prop to hard tubing
8) assemble new prop setup into MJ & shroud
9) test
Besides the kit, you need to provide your own superglue, something you can cut the stainless steel shaft with & some sissors to cut the tubing. It took a little tweaking to figure out how long to cut the hard tubing & where to place the prop to have it all work properly. Luckily, with the kit, you get 12" of stainless steel shaft, hard & soft tubing. So there's more than enough to try, screw up, then try again. In fact, I tried, screwed up, tried again & still had enough shaft & tubing to make a 2nd mjmod. Of course, I ordered an extra shroud, centering cap & prop when I ordered the kit. Once you figure it out, making the 2nd was much easier.
Also, there are 2 different size shrouds available, and different size props to be used with the different shrouds. Of course, the larger gets you more flow. I used the large size.
HTH,
Rob