What is the 84-028 screw?

A from Wilmington DE says:
August 12, 2014
Your 84-028 Peachtree Patio Roller, is the spring loaded one, with that screw on the back for height adjustment?

Thank you for your help.

Peter
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Tom from SWISCO responded:
August 13, 2014
Yes, the screw allows you to adjust the 84-028.
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