I dount anyone knows what the internals of a right angle drill are like? Something like the one below:

http://www.amazon.co.uk/Ryobi-Plus-R.../dp/B006XBU0K0

Don't know if they are mountalbe direct out the case, if they are metal geared in the right angle stage or anything and at a good price I don't want to spend out just on the off.