Pickup Springs 3.0mm Axles (48 Pack) 48 springs sized perfectly for zero friction addition when used to add power pickup on 3.0mm axles (Some O some OO and HO wagon/coach stock and some tender axles). They are a delight to use. _ Simply remove one wheel add the spring and replace the wheel-set making sure you note which wheel is to the track. Drill a small hole in the floor of the coach/tender/caboose etc and solder a bit of fine wire to the tag end on the spring. Connect the wire to your flickerfree or loco pickups etc. You will be delighted these friction-free pickups. They will add nothing to the drag at all and will always be able to give perfect pickup as long as you keep track and wheels reasonably clean.