I purhased a Sigma Art 5a which tested ok but feels very rough.
Could anyone tell me if these rollers look correct or if somethings missing? I'll need to replace the bottom one but have not find a source as yet.

img_20200211_191216.jpg img_20200211_191228.jpg
Additionally the guide bar has allot of surface rust which I plan to remove with a wire wheel. Should any lubricant be placed on the guide bar (what the handle rides on)?

Any tips on dialing these in? I noticed both roller bolts of "adjust" written next to them.