Try this; with the spinnaker on the ground, spike each corner into the grass so it doesn't move around. With a tape measure, measure the distance from the head of the spinnaker to the first tell tale. Then measure the distance from the luff of the spinnaker to the sticky where this tale is attached. Carefully now, place one hand on the spinnaker whilst gripping the tell tale with your right hand and pull sharply until the tell tale is free from the spinnaker. Repeat with the other one. Problem is now solved. (seriously, I hate tales on spinnakers ;-) They're distracting from the things you should be focused on...like keeping the luff just on the edge of collapse for maximum flow (all you can do is all you can do - tell tale or not).