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tighten em down witha wrench instead of a screw driver, or place some tach welds where the pies connect to keep the connectors on. and if that dont work , get a rope.
flare the ends out with vise grips or weld a bead on them. It is also important that the pipes line up good so the couplers arent bent all retarded...this is assuming we are talking about ic pipes and not rad. hoses