On the ground the paddles can hit the fuse at their limit, but ive never had them touch in flight. The main work i think, in getting a scale build right, starts with the bearing blocks that lift the mechanics to the right place for the mast to exit the top of the fuse. Below is a pic of what i did on the swift with the Funkey fuse. Not petty but functional, and it gets the sit right in flight. Shot 209 shows how some 18mm tube cut, bent, epoxied and painted for a scale undercarridge looks when done in about 40 mins.