The best thumbs are old shimano ones for mtb's and switch them to friction. Or get Paul thumb adapter and mount shimano 9 speed bar end shifters on them that way you get a very nice indexed system.
I have a set of Suntour power thumb shifters which I am looking forward to trying out :-)
@MCamb started
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The best thumbs are old shimano ones for mtb's and switch them to friction. Or get Paul thumb adapter and mount shimano 9 speed bar end shifters on them that way you get a very nice indexed system.