If you like this post, go ahead and visit my blog: www.bikeblogordie.com I'm not the first person to figure this trick out, but I'll take credit if this happens to be the first guide that pops up on a Google search. This is Part II of an article series I'm writing for Bicycle Times. Why do I want need to modify my shifter? Because if you try running a dropper on an un-adapted shifter the post won't hold its position when you drop it down. WHAT YOU WILL NEED: A small Philips head screw driver.