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The plastic sleeve is a protective cover for shipping only, to prevent the microfocuser from being bent.
It's common for the Esprit focusers to arrive poorly adjusted.
Tension on the drawtube can be increased by slightly tightening grub screws on the focuser which press slides against the drawtube.
Load holding could be increased by tightening a nut which applies pressure to the microfocuser bearing (pinion assembly needs to be removed to do this) but this important adjustment was not possible on my Esprit 80 because they used red Loctite.
Applying pressure to the drawtube and partly apply the focuser lock are work-arounds, but if the scope is new send the focuser back under warranty and get them to adjust or replace it.
Motorizing the focuser is another way to increase load holding but some of us want to focus manually.
WARNING: if you remove the pinion assembly, don't slide the drawtube out or dozens of tiny ball bearings will run all over the place.
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