I've seen more than the usual number of ukuleles this month. Nice ones, too. A gentleman contacted me about amplifying his Martin tenor (all koa - a gorgeous instrument). He'd purchased a soundboard transducer from K&K, which I've installed before. Working within the close confines of a mid-size uke presents a step up in the complexity department. The soundholes are too small to allow your whole hand inside, and the scale length is just a little too long to allow one to reach the desired location using fingertips. Well, it's possible to reach, but precise placement requires luck.
There are two options for installation - thin double-stick adhesive can be used, or superglue, which provides better clarity and tone transfer. The owner was looking for nice clear articulation, and as this was to be his stage instrument he like the idea of rock-solid attachment.
This is the end of a standard 1/4" (6mm) jack glued to a length or thin bamboo dowel. I plug in the jack and fish it through the endpin hole. This is helpful in full-sized guitars, absolutely essential for instruments you can't fit your hand inside. (Electrics with f-holes, etc.)