My full sized packs are all powered by a Makita 12v battery down the booster tube, so after i gutted, modified, and repainted (for funzies) a spirit pack , i wanted to use an easily changeable/rechargeable power source. The booster tube on a full sized pack will easily fit a makita flashlight, which i used for the battery recepticle, but it wont fit the spirit pack. With my very elementary Tinkercad powers i designed and printed a new booster tube that accepts the makita battery...i haven't painted the top of the battery yet , sorry
