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this is what a lot of people use they make them in all sizes.http://www.cabelas.com/product/No-Knot-Fast-Snaps/701927.uts?WTz_l=SBC%3Bcat104793480%3Bcat104779980%3BMCcat104616180
i always retie it just seems better but i could be wrong
Maybe do some reaserch on some different knots. I know I can the an improved cinch not in no time but there might be something else out there that is way easier to tie, something that your kids can do on their own. Heck even an overhand (a figure 8 knot would probably be stronger but if they know how to tie their shoes...) not to get them started with catching panfish would work. They love picking out their own jig, tying it on themselves and catching a fish. Once they want to get into it more then you can show them how to tie better knots for bigger fish and different presentations. I know the palomar knot is really easy but I don't know if you can fit a loop of mono through all the eyes on jigs
Or you could use these. I just starting using them and they work great.http://www.muskyshop.com/modules/cart/products.php/keys/fa+snap/page/1/id/2321/name/StringeaseFastachMultiUseClip
I like to retie. Quite often I feel little nicks on my leaders that I like to eliminate. When your fishing with lite lines a little nick can lead to a break off. To me it's one less thing to go wrong.