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I use window alarms that you can buy at Menards or most dollar stores. They cost less then a buck a piece and you never have to worry about looking at your tip ups again. If I were you I would definitely consider tip up alarms. https://www.menards.com/main/tv-products/instant-alarms-4-pack/p-1444421794028-c-6470.htm?tid=-2087222496755250396
Here is one I did using this window/door alarm from Menards.http://vid358.photobucket.com/albums/oo27/darvbethke/Tip%20Up%20noise%20maker%20%2060a.mp4
Couple of photos on how I attached the noise maker to a Cross tip up.cut a small piece of plywood 1/8" to size of window alarm and attached it to the cross bar with 1/2" screws and a drop of Gorilla glueAttached the main body of the alarm to the side of the plywood.added a small piece of sheet metal to the area where the attached part goes using double stick tapedrilled holes on top and bottom of the removable part and attach fish line to each the bar and flag.Awesome tip! thank you for sharing. im going to try this.