Quantity   Component name
1 × Corrugated Card Rough as you like, it doesnt have to be good. Just dry and undamaged.
3 × Servos Standard mount 9G hobby servos
1 × Foil Tape Or plain foil
1 × Sticky-back plastic I've used clear, I didnt want love-hearts all over my robot
1 × Pack of small screws For the servo lid.
3 × 4mm bolts for bearing pins Any size, rods, bolts, pins, dowel etc.
1 × PVA Glue Or contact adhesive, superglue, flour paste, obscure tree resins
1 × Copy paper For printing the template
1 × Sellotape For cutting the sensor array. Tape the stickyback plastic adhesive side up to work on it.