Help please with clutch master cylinder

[salvatore1]

I replaced the clutch master cylinder today. Took my whole damn day - total PITA. Now here's the wonderful part - it looks to be leaking from where the plastic reservoir (where it meets the metal housing). This thing looks flimsy to begin with and there seems to be a certain amount of play in that area. I notice the old unit had some type of zip tie wrapped around it - this one does not. The unit I bought was a Rhino Pac from rockautoparts.

Bottom line - please do not tell me I need to replace this thing again because I may end up hurting someone or something.