Tenshinhan (post 22nd Budokai) - 2
Son Goku (vs Old Piccolo) - 2.25
Drum - 2.8
Old Piccolo Daimao (~40%) - 4
Old Piccolo Daimao (100%) - 10
Young Piccolo Daimao (initial) - 15
Young Piccolo Daimao (full power) - 22.5
Tenshinhan (23rd Budokai) - 30
Unweighted Goku (vs Ten) - 45
Son Goku (Ten's estimations) - 67.5
Kami-sama - 90
Piccolo Junior (vs Kami) - 93.75
Piccolo Junior (full power) - 150
So Drum would end up being almost at 2% of Piccolo Junior (I said almost 3% before). Still, Drum would defeat him without probelms imo. 1% Piccolo Junior would be at 1.5 (still weaker than post 22nd Budokai Tenshinhan and Goku).