Well the best thing is to bring an original pin to the store. If the old one is broken then pull out another one. OR take the guitar in and have a counter person try a few to see which fits.
Most stores will have a box with assorted sizes in it. When I restored an old acoustic 12 string I found in a garage that nobody wanted, I bought new a machine head set, bridge pins and a saddle at a local music store. For the bridge pins I brought in the guitar and tried out the ones they had until we found a tight fit.
The bridge saddle I actually had to buy 2 or 3 that were the right length and thickness and actually had to slowly mill it down until the action was acceptable. I looked at one website (Tusq) that says their pins that measure .2020 inches/5.14 mm shank diameter(the very top of the shaft) will fit most common guitars including Takamine. So that might be a good starting point for a size guess.
(Their pins are $250 for a pack of 10!) so I'd just use that measurement LOL This fancy bone pin site has a chart near the bottom. http://www.guitarsaddles.com/products.as... Unfortuneately, under Takamine, there is no common size. So I'd say your best bet is bringing a pin and/or your guitar and check all their pins.
Many sites say that some light sanding might be necessary to get a pin to fit if it's too tight. A forum I checked out http://www.acousticguitarforum.com/forum... Suggests if pins are tight you can ream the holes with a pinhole reamer, ($50+).
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