Sitting comfortably on the Nail Chair !
Palm Pump with gauge to maintain the presssure in the air bag
Nails in the seat which can move up and down 
About 600 Nos of plated Dis 4mm x 75mm lg Nails are used at 20mm pitch.Only in the centre area the nails sit on air bag. The air bag assists to maintain equal sharing of load. A balance with nail and 200 grams is kept to see the effect of 200 grams on body....Back
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