I have a HB lift for 4 months Now used it half dozen times. Was going to change a front tire on the Wing got all ready to rock and roll started pumping... nothing went up an inch not any more. Took bike off was expecting to find a ruptured seal and leak... Not one drop of oil on ground. So opened up the jack add plug and was able to see the piston no oil. Apparently they added just enough To get it to work a couple times... has anyone else experienced this with the HB lift? Do I need to be aware of anything else besides adding oil and bleeding? The model I have has metal peddles with out rubber pads on them..