Ghostbear,
The servo arm that operates the rudder also operates the pull-pull on the tail wheel. The servo arm has four holes in each side, the rudder is in the third hole from center and the pull pull for the tail wheel is in the fourth hole on each side of the servo arm.

After talking with my flying buddy and reading other posts on RCU, I have determined that SIG is very Conservative on their CG recommendations. I think that the reason I was always dinging the nose wheel on landing was I had the CG too far forward, and I did not have enough elevator travel to flare for landing with out hitting the nose first. This forward CG makes for a very stable and self correcting platform but I think makes landing more difficult. Any way if you want to convert to tail dragger then go for it it cant hurt. I would suggest that you try to set your Cg a little aft from Sig's recommendations. I originally had mine set slightly nose down when balancing on the spar, now it is neutral on the spar.

TiggerFlyer