Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
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It requires that you unwrap the bars and rewrap when done. (usually with new wrap). It also requires that you remove the cables, both shift and brake. (You may or may not need new inner cables depending on how they fray when removed).
After that you will find a half round indentation on the outside of the shifter body. If you lift the hoods at that point you will see the mounting screw for the brifter to the bar. Off and on is not too difficult if you can handle the cable installation (including setup on the brakes and derailleurs) and the bar wrap.
Are you planning on replacing Sora 8 speed with 105 9 speed or 10 speed. Either will require a lot more equipment to go with the shifters, ie new cassette, new chain, possible new front and rear derailleurs.
Liberal bias makes it's own facts.