Having problems securing masonary Bit on 3/8 Black&Decker Drill 7

Before the invention of the hammer drill, people face a lot of trouble drilling in the tight spaces. They had to break down the parts in smaller units in order to drill it properly. But, now the time has changed and the users can easily drill on a portable manner. But, one might wonder, what makes the best hammer drill
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This corded drill has enough power to drill normal brick masonry without issue as long as you're using a masonry bit.

http://www.homedepot.com/b/Tools-Hardware-Power-Tool-Accessories-Drill-Bits-Masonry-Percussion/N-5yc1vZc23f

it is probably the brushes on the motors are wore out or stuck and not making contact. pretty much junk unless you feel confident enough to attempt repair.

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centre pin on plug socket is usually positive...
think I would **** it and see ....if the replacement charger has a charge light it will probably not light if you have reversed polarity. Had the same problem with VHF portables ...I just cut the wire on new charger and tried both options ..reconnected and a bit of tape...voila.
There is little danger to your drill from getting it wrong as long as a the timing is relatively short.

I had to replace the variable trigger on my 3/8 Black and Decker as the trigger failed and would not start the drill.Maybe you have the sme problem as many B&D drills have the same variable trigger.

The switch near the trigger that toggles left or right controls that.

Good luck with your project, Kathleen.

give a good coating of oil then clamp chuck in a bench vice or alike and using short bursts with it set in the forward direction to free the chuck

This is not an ordinary chuck like on a drill. It will only adjust a little bit.

I am going to assume that the bit you are trying to insert is a 1/4 hex drive. If so are you pulling or pushing on the collar of the tool holder to insert or remove a bit. Make sure that the hex on the bit is not twisted also. Let me know and I will go from there.

hi this should be reletively easy hold the end black bit with the sivler bit holde coming out not the black bit next to the yellow case on drill you hold the black part thats at end of drill by where the bit goes into not the black bit near the trigger hope i explain this ok.
Hold this bit tight then put drill in reverse then press trigger a couple of times it might be tight but shouldnt be that tight it wont undo.
1 put in reverse
2 hold black plastic piece near where drill bit goes into
3 press trigger few times
4 this should undo it allowing you to put a bit in
make sure its in reverse else you will just tighten it up more let me know if you need further assistance ok