Now that I've got the proper strings on my BSX Allegro (3/4 size Helicore Hybrid Light) I can play effectively in thumb position. Being fairly new to T-P I wanted all the help I could get, and quickly discovered that without the physical reference of the 'Shoulder' that my DB gives me it was much harder to find the proper position when going into Thumb Position. Enter the 'Bionic Shoulder'. This had been bouncing around in my head for some time so today I grabbed a spare piece of bendable 1" aluminum and, using my DB as a pattern, bent the aluminum to be the same shape as on the 'big bass'. I think I'll find that I only need about the 6 inches closest to the neck, and will likely use this aluminum shoulder as a pattern to cut a piece of wood which I will attach with 3m Dual-lock - which is also what I used to attach this aluminum one. Once I get a smaller wooden shoulder it will be able to stay on the bass and will fit in the bag. For now I'll be taking this one on and off.