Anyone know how to fix this? Leaking air from the back of the rim : r(02)

Anyone know how to fix this? Leaking air from the back of the rim : r(02)

Image gallery: Rim Leak

Tyre Rim Leak Repair at Douglas Jacobson blog HOW TO EASILY FIND AND ELIMINATE YOUR TIRES RIM AIR LEAKS. - YouTube Anyone know how to fix this? Leaking air from the back of the rim : r