Bowflex SelectTech Stand User Manual page 4

Step 3. ( for the 560 )
Remove the Rubber Stabilizers and then Attach the Dumbbell Bases
Remove the dumbbell from its base before you attach the Dumbbell Base to the stand to make sure that the dumbbell does not fall
during installation.
Fully tighten the hardware before you put the dumbbells into the installed dumbbell bases on the stand.
Note: 560 Dumbbell Base not included with Stand.
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Dumbbell Bases
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Dumbbell Bases