Replicator 2/2X Rigid Z-Axis Upgrade

Parts to upgrade:

2 of these https://www.amazon.com/uxcell-Square-Flange-Linear-Bearing/dp/B008X0VB48/
2 of these https://www.amazon.com/PDTech-diameter-bearing-hardened-251mm-500mm/dp/B06VYH1DT2 - select the 10mm diameter, 251-498.5 mm length option, and customize it with a 300mm final cut length
1 of these: 1/4" thick aluminum plate, waterjet to DXF, available from DDFLA
8 of these: M4 Socket Head Cap Screws x 16mm length
8 of these: M4 flat washers 9mm OD max
8 of these: M4 Nylon Lock Nuts
7 of these: M3 x 0.5 mm Thread Socket Head Cap Screws 12 mm Length

Upgrade instructions are here: https://www.instructables.com/id/Makerbot-Replicator-2-Aluminum-Z-Axis-Stage-Upgrad/