Rostock Max Assembly Guide
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15.6 - Join the two platform halves using 12 #4 x 1/4" sheet metal screws.
Figure 49 - #4 x 1/4" Sheet Metal Screw
15.7 - Six screws are used on the top, six on the bottom. Use a P1 Philips screwdriver for this.
Take care not to over-tighten the screw or you could damage the screw holes - the plastic is pretty soft.
After you've got the screws in, work each U-Joint for a bit to make sure that it moves freely.
15.8 - If you have one that's very tight, loosen the screws on that side, withdraw the axle,
remove the U-Joint and file it down a bit more, carefully checking it before putting it back together.
Figure 50 - Screws Installed.
15.9 - Now you need to grab the six Parallel Delta Arms (P/N:68303) and "adjust" them.