Table 3. Bill-of-materials for off-the shelf metal parts.
| Part description | Use | Source | ManufacturerPart number | Quantity |
| Brass press fitbushing (2–56) | Receives set screws for attaching bases | McMaster-Carr | 92395A111 | 4/base |
| Brass press fitbushing (0–80) | Receives set screw to clampelectrode on shuttle and screwsto attach towers to base | McMaster-Carr | 92395A109 | 3/tower |
| Cone point setscrew (2–56) | Set screw for attaching bases | McMaster-Carr | 92785A055 | 4/base |
| Cup point setscrew (0–80) | Set screw for clampingelectrode on shuttle | McMaster-Carr | 92311A055 | 1/tower |
| Phillips headmachine screw (0–80) | Secures towers to base | McMaster-Carr | 91772A055 | 2/tower |
| Stainless steeltubing (14 G) | Rails | Small Partsa | h0083006t304who(B004WPPUKOb) | Cut to length |
| Threaded rod (0–80) | Lead screw | Small Parts | TRX-0080–24(B000FMWBNCb) | Cut to length |
| Brass nut (0–80) | Drives shuttle with leadscrew rotation | McMaster-Carr | 92736A001 | 2/tower |
a
Now part of AmazonSupply, http://www.amazonsupply.com/.
b
Part number on AmazonSupply.