that I have used myself. You need a brown paper shopping bag, if you can get one in Grenada. Not too thick, find an area of the bag that has no creases. Carefully place it over the open housing of the Oberdoffer and gently tap aroung the edges. This will give you a mark to cut around. The inside cut is critical, the outside doesn't matter too much. Coat both sides of your new gasket with grease and install. I find that these will last at least a year, so when I make one, I make a few.
Have Fun.