--> Hotglue
--> 2-component-glue
--> a Pepsi bottle
--> a harder spring
--> several files
--> 1/2" va-steel pipe
--> a tool to drill some holes

the mod is quite easy, you change the spring, take the lid of the bottle and drill a hole for the "streching-stick" (how would you guys call it ?) in the middle of it. remove that overpressure valve inside the original tube, then saw off the smaller targeting part from the tube. after all, you need to file the front nozzle to fit to the steel pipe. use a lot of glue for all parts, because they are only sticked together. the new spring i use is so strong, it would burt the whole gun otherwise..... here are some pictures:

here you see the targeting thing i sawed off and put it back in the gun...

here is a picture of the steel pipe i glued on the pressure tube:

use a lot of fat to smooth the way of the spring and to insulate the tube....

here i have the original and the new spring, furthermore you can see the pepsi-lid
(cutted):

another pic:

the filed nozzle:

the glued steel pipe:

and thats the baby after all modification done:

after all i have to say that with this mod i can shoot nearly twice the distance than
unmodded. the nite finder is a great gun for me !!!

i hope you understand what i wrote, because were a lot of words i dont knew.
i hope i used my new vocabs correct. feel free to PM me if something is not clear.

Source: http://nerfhaven.com/forums/index.php?showtopic=4057