The older manual version of the profurler had a line guard similar to that. The line would ride up and between the drum and the guard confounding the furling of the sail.
Newer designs have modifies the design to capture the line in the drum.
While it is possible that the drum is rubbing, I would not attribute difficulty to use the furler to that friction. You have more than that going on. You need to look at flushing the bearings with dish soap and lots of water. Be sure that yo have the right amount of tension on the fore stay so the tit is not sagging. Be sure the furler line has a proper fair lead and can run unrestricted to your cockpit.
If no adjustment is beneath the drum then perhaps you can bend the line guard a little. Trouble is a little is so imprecise. Too much and the line rides up and causes a problem.