E-flite Blade mCPx - One-way bearing mod

Parts
​​Blade mCPx Main Gear [BLH3506]
Blade mCPx Main Shaft [BLH3507]
One-way bearing [Align 25018 or Gaui 203296]​
Very small self tapping screw and washer

Tools
Drill bit set (7/64" to 7/32" in 1/64" increments)
1/8" to 1/2" Tapered Ream Harbor Freight Item #66936
X-acto knife with #11 blade
3/8" Washer (0.065" thick)
 Cyanoacrylate (CA) "super glue"

---

​This modification can be made without removing the main shaft from the helicopter (as a matter of fact, it is better to leave it installed to get the proper length of the main shaft when trimming).
​
​Start by removing the main gear from the main shaft.
Next using a 7/64" drill bit, carefully drill through the center of the main gear.
Continue to enlarge the hole in 1/64" increments up to 7/32". Take care to ensure that the hole remains in the center of the gear.  If is starts to get off-center, shave a bit off the 'thick' side with a #11 X-acto blade.

Once the hole is 7/32" use the tapered reamer to enlarge the hole to a point where the one-way bearing (OWB) fits snugly in the hole.

Place the bearing/gear assembly on top of the washer (to ensure proper clearance) and press down until the bearing is flush against the work surface and the main gear is flush against the washer. The side of the bearing with the washer thickness will be the top side so ensure that the OWB is properly oriented.

Apply a thin bead of CA around the washer on both sides of the gear.
​
Once the CA has cured, secure the gear/bearing assembly to the main shaft with a very small self-tapping screw that will thread into the main shaft without splitting the shaft.