ORIGINAL: dmurf
Thanks lads for the advice but as I said the elevator is one piece across the rudder and to mount the tail wheel on the rudder I would have to cut the elevator in two. Is it worth the work.
DO NOT mount the tail wheel
on the rudder. Eventually you will tear off the rudder (especially with CA hinges), break a servo gear tooth or loosen up the rudder control horn linkage. You need a shock absorber between the rudder and the tail-wheel. Mount it to the fuselage and fabricate some type of tiller to connect it to the rudder. Or just leave it to caster on its own.