The stop mass is often constrained using simplified models, where it is assumed that all stops decay via a single decay mode. This is not usually the case in realistic models so limits derived from any single simplified model tend to be too strong. To derive more accurate limits one should instead combine information from several different simplified models. I will present a fast and easy technique for doing this, which yields limits that are conservative but independent of the branching ratios for each stop decay mode. Along the way I will demonstrate the importance of a simplified model analysis for mixed decay modes, which is yet to be implemented by ATLAS or CMS.