Those "mushroom heads" will hold if they are big enough. When I tie a loop on I make it smaller than it should be,trim off the excess to about 3/16", then light it for a second. Before the melted end hardens I tap it a little with a wet finger until the "mushroom" is about 1/8" in diameter (orat least twicethe diameter of the string), then let it cool for a few minutes. After I draw afew times the loop gets a little larger and the ends settle firmly into the knots. I've never had one pull loose! Of course you should inspect it periodically. And I wouldn't draw back toward my face...draw then lean your head towards your peep.