Kalimba Hugh Tracey Celeste 11 Pentatonic Sansula Thumb Piano Great sound

This is a fun instrument and I like the broadly spaced keys.Since it is designed with a pentatonic scale in mind, I had ambitions to tune it to a G Blues Scale. Basically, I pulled it off except for the 11th key. The 11th key was too short and the outer keys were barely long enough. If the outer keys were just 2-3 mm longer, it would increase the versatility of the instrument.