Miles Research – User Guide for CRCS-FH4 Chinrest-Camera Support
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Step 5: With the base on a tabletop, insert the chinrest frame (chinrest adjustment ought to be on the right as shown):
Step 6: With the chinrest firmly seated into the base, use the 2.5mm hex wrench to tighten the set screws:
The 2.5mm hex wrench is the smaller one.