As shown in the photo above, there is a rubber plug in the disc part, and the PDF manual that was sent to me separately by email said to fill it with bottled oil using a dropper.
I’m going to ask about the oil specs, it would be fine if standard gear oil was enough…
BTW,I managed to thread an eccentric BB adapter.
Top: The Chinese tool barely cut anything and was useless; it actually cut my hand.
Bottom: The Hozan tool was incredibly sharp and useful.
I used a long bolt, thumbscrew, washer, bench, and cutting oil to thread the bolts with Hozan tools.
I didn’t have a large tap handle, but a 24mm wrench came in handy.
Clean the chips with a brass brush and use parts cleaner to remove the cutting oil and fine chips.…Threading completed.
The left-hand thread on the right side and the right-hand thread on the left side have been neatly cut.
Since this is manual work and not machining, the precision may not be perfect.
Install the bearing BB axle that comes with the GTRO kit and tighten the left cup so that there is no play in the axle and the bearing turns without resistance, and the eccentric BB for GTRO is complete.
Do I need to use thread locking compound on the cup threads…?