Manufactured by Steve Porter, the original escapement wheel was digitally probed to create a 3-D CAD. This file was then used to waterjet a practice aluminum piece to ensure correct fitment with the pallets, before finalizing two brass replacements. 

Similar to the escapement wheel, Steve Porter first created digital renders of the pallets using the original profile. Next, the pallets are CNC machined out of stainless steel and heat treated for extra robustness. 

Steve Porter also remanufactured the spine of the escapement wheel with one major difference-the bore sizing.  The original spine had over-sized bearing holes, which required bushing to compensate the difference. To ensure that maintenance remained streamlined, the new spine has precision holes which allow the bearings to be press fit without the need for bushings. The material remains aluminum, and an anodized spare will be given to TRI for future installment. 

Although not directly purchased during this project, the replacement differential was purchased during the original creation of the clock. This spare part was then held by Steve Porter as memorabilia, until he so kindly offered to exchange with the original differential. Similar differentials, along with other purchasable components, are listed in the User Manual for future reference and replacement.

This 12V battery was purchased through Amazon to replace the original battery that was found to be dead. This battery holds similar specifications to the original battery, differing only by 0.5 Amp. Hr. With proper set-up and maintenance, this battery should last 15-20 years within the clock. 

A total of thirteen stainless-steel shieled bearings and fifty e-rings were purchased to replace the original corroded and over-greased bearings. All bearing dimensions were preserved, while the team took the liberty of choosing their precision. Eleven of the thirteen were ABEC-5 (medium-high precision) with the remaining two being ABEC-7 (high precision), used for extremely low friction areas. 

Three sensors, including an accelerometer, temperature sensor, and IR break beam sensor, were purchased through Adafruit or Amazon for the testbed. These sensors are for data collection purposes and do not remain on the gearbox.