Thank you for your response Michael.
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>> "Hi AJ, can you please also post the 3DM model file of your object instead of only a screenshot? With the actual model file it's then possible to zoom in closely to examine different areas and rotate around it, etc... it's a lot easier to see what kind of situation you have that way rather than looking only at a screenshot."
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Yes, I can do this. Thanks.
You will find three main solids in the scene named: roller, longer and shorter. Only on "shorter" I cannot apply the fillet. There are also some shading problems on one side of the "roller".