Raptor 30/50 v1 assembly manual
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The first picture below still shows the frames apart, but don't worry, you don't need to do that, it's just pictured this way so you have a clear view of the start shaft (13). The start shaft is larger on one end. This will be the bottom. Insert the shaft through the clutch bell (16) and up through the top bearing. Notice that the top of the shaft has two flat spots. In the second picture you can see the start coupler (14) slides down on the shaft. With one hand, push up on the start shaft from the bottom. Ok, remember the flat spots? You need to rotate the start coupler so that the two holes in the side match up with the two flat spots. Make sure the start coupler is all the way down (you are still pushing up on the start shaft right?) Put blue loctite on the two set screws (6) M4x5 and screw them into the start coupler. Check for any up/down play in the start shaft. As long as you were pushing up on the start shaft and down on the coupler then you should not have any slop.
Note: Later if you have to remove the start shaft you could run into a problem with the shaft getting stuck as the top part gets to the bearings. This is caused by the set screws pushing the metal outward around the flat spots. The bulged area is then too thick to go through the bearings. I use a dremel with a grinding tip to remove the bulge. Don't just knock the shaft through the bearings, you will more then likely damage the bearings.
Ok, one last thing for this section... install the fuel tank. Before you do this, take some sandpaper and smooth the sharp edges of the frame where it will touch the fuel tank. In the third picture look at the three red arrows. This is the section that needs to be sanded. To insert the tank, just spread the back of the frames a little and push the tank in. There are some notches that it will lock into. BTW: Later when you need to remove the tank to change out the clunk line, simply remove just one of the rear landing skid screws. This will let you spread the frame enough to pull the tank out the back.

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