Hi everyone, I am considering building a switch rod from a 10' 6wt Rainshadow RX7 blank. I would like to extend the rod length by glueing a six inch length of salvaged graphite rod onto the butt. Is there a downside to doing this?

i built this exact same rod into a 10' 8" switch. i don't think there is anything wrong with your approach but i will share mine. i used a pack bay A8 reel seat. i used the 5" extention butt and removed the cork. to the 5" shaft i epoxied a piece of aluminum tubing that i got from "hobby people". over this i built an 8" extension butt. i used a 10" pre-made spinning handle that i cut down slightly. i have an aluminum, rubber tipped butt cap on that. now i can unscrew the extension handle and put in a standard 2" fighting butt, use it without a fighting butt (pack bay makes a nice screw in cap) or use it two handed with the 8" butt. it is a nice rod, by the way.
i caught a couple of hundred bonito on it last summer.

Thanks Larry, I guess my only concerns are with warranty issues.

if you are concerned about voiding the warranty shoot batson an email and ask. my method probably would not void it. yours may not either but i would check.