I recently bought the JP Premium. Two days into playing, the stationary ball under the kinetic jeep came loose. For the life of me, I can't get the stationary ball back onto the playing field. When I try to press it back on to the peg, it just pushes down into the table, and the nut underneath is tightened as far as it can go. Any ideas on how to repair would be much appreciated. Thank you in advance.