drum staves

[Riccardo]

Hi, i just started to use lilypond (with frescobaldi editor). 
I use it for writing drum set scores. 
My problem is this: i need the small tom to be in the place of the hi hat
 (in the last upper space in the 
staff… E note placement so to say…)
i try to read the manuals but couldn't figure out how to change 
this…
i need this because i prepare students for London College of Music
 and their standard notation 
has the small tom in this position. Thank you so much for your help!!