tyrnos preset knob oring upgrade

[bill collector]

  I was wondering if anyone knows the size of the slightly larger then stock oring some people are using to stop the preset knob from creeping down during a days fishing. I've got some Tyrnos 30's I want to change out the orings on.

[alantani]

key # TGT-0784, right?  http://fish.shimano.com/media/fishing/SAC/techdocs/en/Conventional/05TYR30-2Speed_v1_m56577569830615691.pdf

didn't know it was a problem.  had a similar issue with the accurates.  i went to a hardware store and bought a big assortment of o-rings.  never did find the right one........