I recently bought a used Jobo 3005 Expert drum and found that it leaks a little while on my roller base. The lid slips on and off very easily, so I'd guess the two pieces are a little worn down from use, and they no longer make a tight seal. I have a Jobo 3010 that requires the foot pump to pop the lid, but the 3005 lid just won't go on tightly. Any suggestions?