Nakamichi Sankyo & Mabuchi RF500TB 12560

Known dead spot on original reel motors which can be replaced with Mabuchi RF500TB 12560
Problem: Mabuchi RF500TB bearings are from steel and not from sintered material.
Solution: open new Mabuchi RF500TB motor and put synthetic oil on bearings.
Long term solution: no solution exists...you just need to oil bearings every 6-9months.
...OR JUST REBUILD ORIGINAL MOTORS AND YOU ARE GOOD FOR NEXT...HMMM...10 YEARS:-)
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Are all MABUCHI RF-500TB-12560 new motors the same ? Are new old stock MABUCHI RF-500TB-12560 the same ?