Would this work for demo of a brick chimney?

Definately. I use it for ceramic tile and stone demo. You will need plenty of air tho. I use a large compressor for this

Would this work for grooving out cracks in concrete for patching ?

Yes indeed. I have done some work to repair concrete cracks and the tool works great. It's best if you have an ample air supply.

How difficult was it to get the spring on? I think this one might have bad threading because it doesn't seem to want to go on.

The spring has a rounded hook with a tab on one end to hold the shaft of the chisel loosely in place. That end is on top. The other end just has a tab. If you use the two tabs on the spring to twist it on and off the spring will thread more easily. The tabs relieve the tension of the spring.

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⚡️ Unleash Pro-Level Impact with Every Strike!

SHOCK ABSORBING HANDLE - Minimizes vibration for reduced fatigue during extended use
VERSATILE COMPATIBILITY - Fits standard .401" chisel shanks to tackle any job with ease
EFFICIENT AIR CONSUMPTION - Optimized 4.5 CFM air use balances power and economy
LIGHT AS AIR TOUGH AS STEEL - Lightweight aluminum body designed for all-day comfort and durability
PRECISION POWER AT YOUR FINGERTIPS - Touch control trigger for effortless, responsive operation

The DEWALT DWMT70785 Pneumatic Chisel Hammer combines a lightweight aluminum body with a shock-absorbing handle and a responsive touch control trigger. Operating at up to 2,600 BPM and accepting standard .401" chisel shanks, it delivers professional-grade performance with efficient 4.5 CFM air consumption. Backed by a 3-year limited warranty, this tool is engineered for durability, comfort, and precision on every job site.

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$217.34

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Manufacturer	Dewalt
Part number	DWMT70785
Item Weight	1.54 Kilograms
Product Dimensions	20.83 x 20.07 x 6.35 cm; 1.54 kg
Item model number	DWMT70785
Size	One Size
Color	Aluminum
Material	Metal
Power source type	Air Powered
Maximum Power	300 Watts
Item Package Quantity	1
Number Of Pieces	1
Number of Handles	1
Speed	2600 RPM
Switch Style	Trigger Switch
Special Features	Lightweight, Portable
Included components	Chuck Key
Batteries Included?	No
Batteries Required?	No

DEWALT Chisel Hammer, Pnuematic (DWMT70785)

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