Hi-
I apologize for the confusion. The B+D 7004 is a single speed drill and does not have a reverse switch option available on it.
Some model 7004 have a switch on the left side of the handle marked "R/F". In other words, as you hold the drill with the right hand, the switch should be near your thumb.
The now vintage B&D model 7004 type 1 was a single-speed, non-reversible drill. There is no reverse switch.
SOURCE: inserting new drill bit
Assuming that it is this drill:
http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/blackdecker/7144-04_TYPE_4
You will need a chuck key - hopefully you have that with the drill. It's a little t-shaped bar with a cog on one end. You put it into the holes in the chuck (the part at the end which grps the bit) and turn anti-clockwise to open the jaws. Place a bit in the centre and then turn it clockwise to tighten. Tighten the bit using each of the three holes in the chuck and make sure you remove the chuck key before you use the drill - keep it safe!
SOURCE: Black and Decker KD950K drill - how to insert drill bit
most keyless chucks have a button on top that you push in near the chuck it locks so you can tighten or undo
SOURCE: HOW DO I LOOSEN A KEYLESS CHUCK TO REMOVE A DRILL
Keyless chucks normally have a knurled ring at the base of the chuck that you hold in one hand while turning the large knurled taper with the other. If the chuck has been overtightened, and you cant open like this, try using two stilson wrenches (Pipe wrenches) one on each of these parts. Use a soft cloth in the jaws to avoid damaging the knurling. You can also try some Q20 or similar into the chuck to help lubricate it.
SOURCE: Black and Decker Cordless Drill Chuck stuck in full open position
I'd put penetrating oil in it and tap the chuck with a plastic hammer. That should free it up.
Best rgrds, W/D
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