Has anyone had good luck with a replacement valve stem on the C-10 front and rear mag wheels? The last time I replaced the valve stems was ~ 5 years ago. The valve stem on the rear tire is leaking pretty bad. It looks like there is a bad seal between the bottom flange of the valve stem and the rubber seal that gets "sandiched" against the rim. The valve stem is made by M/C Enterprises (P/N 59-6945)and has a 45 degree angled valve stem. Do you think that I can get away with cleaning up the rim and putting some kind of sealant on the rubber seal? Any ideas would be greatly appreciated.