I trolled a TM bunker spoon for a very brief period of time on my last trip and lost a keel. This was probably only the 2nd or 3rd time trolling this particular spoon. I realize things come loose but, really this soon? I would have expected something a little longer lasting from a $40 spoon with the reputation that TM carries. I now have to assume the screws are not pretreated with Locktite and will remove the screws from any additional ones I buy. Can replacement keels be purchased??