Anybody have problems with the Toro Proline 21 hight adjusters? I have been using them for 15 years and its the only complain I have with them. There great mowers but the adjusters get loose in about 3 months then in 6 months I use bungee's to hold them in place, then in a year its new parts. I wish they would make it better. I do maintenance on them but that doesn't seem to help. Am I alone on this how about you?