I recently bought a used Perry carb that someone had soldered a 2" piece of brass tubing on the NV to extend it. Long extensions on needle valves can cause problems over time due to the vibrating weight on a long moment arm. Another method I've used is to add a socket head/Allen screw to the short NV that only requires a small hole in the cowl and use an Allen driver to reach through the hole to tweak the NV. A short length of fuel tubing over the NV/screw head (never needed it) might help reduce the effort to 'find' the socket head on a vibrating/running cowled engine. This slight hassle is worth it (to me) to save the carb/nv assembly as well as the looks of the front end of the airplane. Once it's set, the NV shouldn't need much tweaking for the day's flying.

Terry in LP