Thank you that is the kind of thing I am looking for but unfortunately they don't seem to sell eiger ultra x heads. O well I will call them and see if one can be procured.
Hopefully I am putting this in the right place... I tried e mailing them directly and no response, I then tried Google numerous time and found people referring to using different heads on bodies and how modular eiger are but nothing on how they got the extra heads barring trade or just buying...