Daft question: Plug has Sugino RD cranks AFAIK. Is the chainring on the inside? If so , swap it to the outside.
Agree with Kowalski, but possibly not with dmczone: Sugino 103 BB has one cup fixed to the BB and threads are opposite so it is unlikely that it is the wrong way round.
Sounds like a very worn right crank. Have you removed it before?
Daft question: Plug has Sugino RD cranks AFAIK. Is the chainring on the inside? If so , swap it to the outside.
Agree with Kowalski, but possibly not with dmczone: Sugino 103 BB has one cup fixed to the BB and threads are opposite so it is unlikely that it is the wrong way round.
Sounds like a very worn right crank. Have you removed it before?