Thanks, the cable had already been repaired more than once; wasn't a very sturdy system. The treads on the welded nut seemed coarser than a fine tread but the other, smaller bolts used on the ROPS system do have fine treads so I'll give that a try.
Lost the bolt that screws into the welded nut on the inside of the ROPS that you use to hold the foldable arm in to up position (or keep it from wiggling when it's in to down position. The Kubota parts list only shows a part number (TA240-48752 Bolt Kit) but no bolt specs and my dealer could...