If you don't use the warrantee (time constraints?), and just want a quick fix as a standby rod, take the tip section to a fly shop and "try on" different sized tip-tops. Or, if you don't have a shop in your town, or close by, tell H&H the measurments and they could suggest a couple sizes that may work. They're fairly inexpensive, even if you buy a few of them, try them on to size, and ask the guys at H&H what their return policy s on the ones that don't fit.
Trouts don't live in ugly places.
A friend is not who knows you the longest, but the one who came and never left your side.
Don't look back, we ain't goin' that way.