is this what you are looking for?

An inexpensive power drill for small drills: Modifying the Tamiya Handy Drill

http://model-railroad-hobbyist.com/node/11404

I used a battery powered

One of our Advertisers Micro-Mark sell them

If you click on the following link you can find the small battery operated drills and screwdrivers.

http://model-trains-universe.com/am3/cgi/index.php?req=am_track&tracker=10&campid=13

This following link will take you directly to the Micro-Mark Mini battery powered Drill.

http://www.micromark.com/more-power-tools.html

Push drills

Consider a small push drill. Like a pin vise on steroids. Here's a link. They have two sizes, for the two ranges of small bits:

http://www.pjtool.com/minipushdrill.aspx

AA Battery Tools

After buying a few rechargeable tools, I grew weary of chasing specialty batteries when the things died. My solution was to obtain a couple of tools that used rechargeable AA batteries. I keep two rechargers and 16 batteries

http://www.lowes.com/pd_168848-353-7000-PK_0__?productId=3284586&Ntt=dremil&Ns=p_product_price|0

Yes it is listed as a pumpkin carver, but it takes 1/8 accessories.

http://www.homedepot.com/p/BLACK-DECKER-6-Volt-Alkaline-Battery-Cordless-Screwdriver-AS6NG/202516259#.UZmNZZyrJZc

http://www.bestbuy.com/site/Energizer+-+Battery+Charger/1262068.p?id=1218273566593&skuId=1262068

Drill chucks can be found for both of these tools. Both of these can be used for many model related jobs.

Note: I prefer hand drills for plastic,

Regards, John

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However beautiful the strategy, you should occasionally look at the results. <>   Winston Churchill