I usually bring some kind of tool with me when I ride. It stays in the car on day trips and in the cabin on longer trips. I keep it in a small travel bag with some other tuning essentials and even though I don't carry it while riding, size/weight is pretty important for packing purposes. Your tool looks huge
. It may not be heavy, but the size would turn me off right away. Especially since the central hub is the biggest part and it has no real purpose. Either give the hub a secondary purpose or minimize it as much as possible. Turn the hub into a wax scraper or something. Also, given how stylish people are on the hill these days, I can't see anyone ever wearing it around their neck unless maybe you draw a clock face on it and get flava-flav to endorse it.