I offer an alternative method which I utilized recently, Secure a fishing weight in a vise and saw off a piece with a hack saw and then pound it with a hammer until it resembles a fat quarter. Then drill a hole through it. Mount it with a bolt and locknut through the fuselage as far foreward as possible. By this method, I got approximately 2.5 oz per weight.  I have learned that weight is not as bad as I have been told. The plane still flies well but next re-build I will be more conscious of the consequences of strengthening the plane too much. Since, the rebuild however the plane is much less susceptible to the consequences of a rough landing. .....Wayne