This instructable requires a few custom materials and tools. The lab
where I made the sensors already had most of the materials/tools available or they were custom-made there, so I apologize for not being able to direct you to specific suppliers/part #. If you try the instructable, please post where you got your materials from!
Part: Nylamid spacer (Diam: 13mm, Thick: 2mm)
Qty: 1 per sensor (reusable)
Part: 20A Shore RTV Silicone
Qty: ~2g per sensor
Part: 65A Shore RTV Silicone
Qty: <1g per sensor
Part: Acrylic (transparent plastic) board with circular indentations
Specs: 25mm minimum width and length
Centered indentation depth: 0.4 - 0.6mm
Centered indentation diameter: 4 - 6mm
Additional indentations at a minimum 30mm distance in any direction
Other: Assorted modeling hand tools, precision scale, metal roller, silicone solvent.NOTE:
You can get the silicone and solvent from Nusil Technology
. The modeling tools, you can probably find in a good art supplies store.