Inquiry (采购产品): Screw Jack We mfg. and work on pivot irrigation systems. In the field we need to lift the pivot tower off of the ground to change tires. The jack we currently use has caused injuries because the handle will slip out of the person's hands and strike him in the face. I am looking for a different type of jack that is safer to operate. Do you have any suggestions? **** Hidden Message ***** Gary Coler 68902-1047 Company: T-L Irrigation Co., P.O. Box 1047, Hastings, NE. E-mail: gec@tlirr.com **** Hidden Message ***** gec@tlirr.com