I am researching changing my drop bars on my surly long haul trucker to butterfly/ trekking bars. In understand to mount the bar end shifters I will need a Paul Thumbie mount. The bar end shifters on the bike are BSM10 10 speed, my question is do they pull apart so they can be successfully attached to the Paul Thumbie?. I am assuming that you only use the handle part of the mechanism?. I do not want to jump in and then find out I am up for a new set of shifters as the Paul Thumbies are expensive as it is. Appreciate any help thanks.