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LEDmodMan said:
I think they meant these rings are from bicycles:
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Thanks everyone!
I used the parts for the bicycle and the motorcycle for this mod.
That is the bicycle parts for head spacer.
TIOGA bicycle parts. 1 set(4 rings) is 1000 yen(about 8 dollars).
This aluminum rings is the motorcycle parts for bolt spacer.
I made the hole by the drill.