Bicycle Mechanics - Shifter cable sheathing too short, can't turn

Over the last two evenings I have converted my 1999 Gunnar from 9 speed Ultegra to 10 speed Ultegra.

I got a great deal on the shifters, cassette and chain. Just a hair over $200 for NEW in box shifters, 12-27 ultegra cassette and a SRAM 1030 10 speed chain.

I finished assembling all the parts after work yesterday and after a few test rides I determined that I liked the shifter placement on the bars but that the reach was slightly too long so I rotated the bars up a touch, only to find out I could no longer turn left because I hadn't left enough slack in the sheathing on the right shifter :cry:

I'd like to use new sheathing to go with the new cable, but I'm not sure if any of my spare pieces is any longer than the one I used on the right shifter. So, assuming that the cable still has enough slack to fasten to the derailer after I add more sheathing... Would it be a big nono to use two pieces of sheathing between the shifter and the barrel adjuster and tape them together or something??

Rookie mistake, I know

They have to be one piece to function properly. They are a structural (for lack of a better term) part of the shifting process. Replacement housing is pretty cheap. Most LBS have it on rolls and sell it by the foot.

In theory, you could connect two pieces of housing with a double ferrule. In practice, your LBS probably wouldn't have one in stock and you'd have to wait a week while they ordered one from QBP and it would make much more sense to just buy some new housing.

LBS it is I guess... Then the problem is that I have to try the new housing and see if the cable will still work or if it is too short.

It most likely will be to short so I'll end up driving in circles to save $2 ...

Yep, you need one single piece, dirt cheap at maybe 3-4 dollars.

inline cable tension adjuster can allow you to join two pieces of shifter cable housings together.
you'd still need a new cable because the cable might become too short this time.