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If you can't find with a search for st-ef40 diagram or on the Shimano site then it does not exist. Although not identical carefully disassembling the other shifter may give you enough insight.
Since you don't specify the make or model a manual is not likely to be recommended for you. However, gears adjustments are sort of generic within limits. Try this link and find your shifters...
Go to http://techdocs.shimano.com/techdocs/index.jsp
Search in drop down list to go to all tiagra items and identify your particular components. Shimano are good at numbering their parts and you should find the number you seek on the bicycle component. You will usually be able to download an exploded parts diagram and service instructions. The service instructions are prefixed by the letters SI.
You must replace your shifter with one that is the same type, that is, if it is a six-speed shifter, you must replace it with a six-speed shifter. Also, if you have a Shimano derailleur, then the shifter you get must be a compatible type. Shimano uses a 2:1 actuation ratio, so you have to use a Shimano shifter or a SRAM 2:1 shifter (Attack, Centera or MRX models).
The only stupid questions are the ones we don't ask, friend. Look on eBay under bicycles for "6-speed shifter" and you will be able to find some really good deals.
When it comes time to work on your bike, go to Park Tool's website (parktool.com) and on the top right corner is a "Repair Help" link. You can select your topic by highlighting the part in question on the bike.
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