20 Most Recent Black & Decker 5700 Powershot Forward Action Stapler - Page 8 Questions & Answers

Here is detailed description http://powertool.manualsonline.com/support/black-decker/sander/how-do-you-put-sandpaper-in-the-machine-5047429

Here s one Black Decker Belt Sander 7496 User Manual

A tommy bar is used to lock shaft whilst collett is tightened or reverse by spanner. Easier if motor unit removed from clamp assembly

Hi Brent- We would be happy to assist you with you further. Please email us at [email protected] and include your model number and exactly what it is you are asking. We would be happy to get back to you by email. Thanks

Here is the manual:

http://www.dewaltservicenet.com/documents/English/Instruction%20Manual/7604%20TYPE%204.pdf

If your looking for parts you can logon to this site:

http://www.blackanddeckerservicenet.com/servicenet_home.aspx?AspxAutoDetectCookieSupport=1

My answer comes almost a year after the original question, but I'll post it anyway for those who end up here after a search.
Black & Decker no longer supplies drive belts for the BR400 sander, but you can get a replacement elsewhere if you know what to ask for.
The belt is a synchronous, single-sided "XL" series belt, and mine had 120XL031 printed on it. The belt width is 0.31in or 5/16in or 7.9mm. Its pitch (distance from tooth to tooth) is 0.20in or 1/5in or 5mm. Its total height is 0.09in, and tooth height is 0.045in. It has 60 teeth, making the total length 12in.
I found a replacement at sdp-si.com, part number A 6R 3-060031.
Look here for timing belts (inch), then narrow the search for single-sided, .200 (XL) pitch, 60 grooves, 5/16 width.

Hi Becca, You haven't given me much context to go on here, but this probably means an area 10 feet wide by 10 feet long, which is 100 square feet. If this is about a liquid (like glue or paint) then this is equivalent to any other shape of the same area, like 5 feet by 20 feet, etc. I hope this helps you. Al K

It appears that you have adaptors for the blades that are the same thickness as the blades Place the adaptor in the centre and then put on the spindle and tighten up the plates onto the blade.