TelStar26, we have had this very same thing happen to us with a brand new net
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So the next net got the treatment.
Go get a can of door and window foam, get about 4 feet or so of clear plastic tubing (cheap stuff, that fits the straw on the can, and fits inside the rim of the net)
Take the caps off of the ends of the net rim and the handle, hook up the clear tubing to the straw on the can of foam, insert tubing through the inside of the net rim and start to release the foam, once some starts to come out of the end withdraw the tube at an even and steady pace to fill the net rim as you go. Once you have finished the net rim, move on to the handle same procedure. A note about the handle: If your net has one of those spring release lock buttons, I would suggest popping it out of the handle and inserting a rag or something to stop the foam from filling the space that the spring mechanisim occupies, I learned this the hard way, I had to pick out the foam bit by bit until I could remove the spring assembly and thoroughly clean so that it worked
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This process works well, I found that a can is about enough to do a couple of long handled large nets, so if you have a buddy or neighbour that need theirs done also, set up to do both at the same time and split the costs. Even at one net per can the cost of less than $15 is well worth it, considering the cost of a new net
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Good Luck.
FH