Im not an expert but have done a few sucessfully. For us amateur's the binder clamps work well. I would apply more clamps you can fit 15 of them across the back and close to that amount in the front. I probably use 5 or 6 dozen all the way around. As tracy said you need to stretch to the sides, use the clamps on the sail panel thin metal strip with the wood/cork in it. The clamps will help you hold the side stretch, just after the sail panel theres plenty of room to fit more clamps along the sides. If you cant get a good stretch on it the listing strips may need to be cut back a little more, did you fit the bows in the listing strips prior to hanging it? They typically sew the listing strips in very long and if you lay the bows in you can trim them back about an inch from the end of the bows. Hope this helps 
 
Rich
		 
		
		
		
		
		
		
		
		
	
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