Chemglass CG-2077-M - Manual (Page 6)

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Step 4: Slide the PTFE ferrule (bevel down) over the shaft, followed by
the stainless steel spindle nut. Tighten the top spindle nut until the
spindle begins to rotate.
Step 5: Using the brass wrench, hand tighten the nut as necessary.
The nut will secure the ferrule to the shaft which will keep the shaft
from spinning in the spindle. Please note: if both the spindle and the
shaft rotate separately, then further tightening is needed. The stirrer
shaft and spindle should rotate simultaneously. Do Not Over Tighten.