Putting tape on the ergs that show where the chain should be coming into and away from is a great way to teach handle heights. You could do this yourself but it's easiest to have a teammate get on the erg to position the chain while you mark where the tape goes. I recommend using brightly colored duct tape - electrical tape is too flimsy and if dust gets on it it won't stick to anything. Plus, duct tape is about 1.5" wide so it gives the rower a better visual for where the chain should be.
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Working together in a team is something that I find rewarding, as it is exciting to use everyone's individual strengths to reach a common goal. I pride myself on being a good leader as well as an effective team member.