drum line has dropped off page 1

Hi all
I have recently revisited a score of mine and started to rewrite parts of it. Somehow I have managed to make the drumkit drop off page 1. It is there on all other pages. I have included a much slimmed down version as an example. Any assistance in getting the drum kit back (so that I can print a conductors score) will be greatly appreciated. Where did I go wrong?!
Thanks in anticiapation