All of the following modifications increase the retention of an endodontic post EXCEPT:

Post retention is primarily enhanced by: (1) post length (longer posts have greater retention), (2) surface roughness or serrations (increase mechanical interlocking with cement), and (3) resin cement (provides superior adhesion compared to zinc phosphate). Increasing post WIDTH (diameter) does NOT significantly improve retention and actually increases the risk of root fracture and strip perforation by removing excessive radicular dentin. The minimum dentin thickness ('ferrule') must be maintained. Post length is the most important factor for retention; increasing width beyond what is necessary is contraindicated.