call synlawn in your area and ask if they have any precision putt remnants. 15' rolls, so when they have 6' left over, it is a 6'x15' piece and then just use some of those metal cup things with the flaps your ganpoppy use to have. i still have a couple somewhere
make sure precision putt, it has a backing and will relax flat on cement fairly quickly if rolled up
oh, these things...