I have 40 year old centerline's 15x3.5" that are the original 2 piece rivet wheels. They're leaking air in-between where the bolt holes are. They originally have a nice silicone right in the middle inside the wheel to keep the 2 piece wheel from leaking the way it is. Ive tried using my own rtv to seal and it doesn't seem to work. Anyone else had this problem or know how to fix it?