Rubina came with a throttle friction device. I have installed a cruise control, so it's no longer required. I have removed the large knob that controls it but that leaves a 12mm gap where the threaded section is that the knob sits in.
If anyone would like it, we'll need to do a swap of bar-ends because it's integrated in the RH bar-end. If they're identical it wouldn't be necessary to swap the LH ends.
This is probably most relevant to Brisbane or nearby riders because of the weight of them and the need to do a straight swap.
I think $20 is pretty generous. It's unbranded but identical to the Kaoko one listed at $169. I put a Throttlemeister on my first ST and found the smooth surface to be less effective than this type.