It looks like these might only be good on umbrellas that are the same. Anyone with experience with these?
here's a link
http://cgi.ebay.com/Stroller-Connec...mZ130088350673QQcategoryZ117038QQcmdZViewItem
here's a link
http://cgi.ebay.com/Stroller-Connec...mZ130088350673QQcategoryZ117038QQcmdZViewItem