I have several Do-it molds and have never had any problems making Jig heads with them . I make sure to oil the hinge after the mold cools back down . Do this after every use and these molds will serve you for years to come.Only reason I bought this one is I loaned the other like it out to a friend and it never returned . That mold was over 20 years old and I have some older than that . You really can't go wrong with a Do-it . Unlike a widget which never works...; )