Shivvers Mfg. of Iowa, makers of Country Clipper mowers, is making a voluntary product recall in conjunction with the Consumer Product Safety Commission. The company is recalling 450 jack lift tools and kits. The jack lifts can have threads stripping or the nuts breaking, resulting in the shaft slipping and the mower falling from its stand-up position. Shivvers has received five reports of jack lift failures and 37 warranty claims for replacement parts. Two versions of the jack model have been manufactured. Version number one was made with a nylon nut, and version number two was made  with a sintered bronze nut. These recalled jacks were sold separately and on Charger, JAZee and Boss riding lawnmowers. The mowers were sold by Country Clipper dealers nationwide from May 2007 through June 2008. Visit countryclipper.com or download their Recall Alert PDF.