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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Description

⚡ Power through projects with DEWALT’s high-speed air chisel hammer!

BUILT FOR COMFORT - Shock-absorbing handle reduces fatigue during extended use
VERSATILE CHISELING - Includes 3 standard .401" chisel attachments for multiple applications
DURABILITY MEETS POWER - Robust aluminum body with 20 Nm torque for heavy-duty tasks
PEACE OF MIND WARRANTY - Backed by DEWALT’s 3-year limited manufacturer’s warranty
PRECISION AT YOUR FINGERTIPS - Touch control trigger for effortless speed modulation

The DEWALT DWMT70785 Pneumatic Air Chisel Hammer combines a lightweight aluminum design with a powerful 2600 BPM impact rate and a shock-absorbing handle for superior comfort. Featuring a touch control trigger and compatibility with standard .401" chisel shanks, it includes 3 chisels and operates via a 1/4" air inlet. Perfect for professionals seeking precision, durability, and versatility, it’s supported by a 3-year limited warranty.

Specifications

Brand	DEWALT
Power Source	Air Powered
Maximum Chuck Size	6.35 Millimeters
Color	Multi
Included Components	(5) Chisel Set \| Pneumatic Oil
Special Feature	Variable Speed
Product Dimensions	8.34"L x 7.25"W x 2.57"H
Material	Blend
Maximum Torque	20 Newton Meters
Speed	2600 RPM
Item Weight	3.4 Pounds
Maximum Power	300 Watts
Drill Type	Basic Drill
UPC	076174707854 784497210219
Global Trade Identification Number	00076174707854
Manufacturer	Dewalt
Drilling Capacity Metal	0.4 Inches
Part Number	DWMT70785
Item Weight	3.4 pounds
Item model number	DWMT70785
Is Discontinued By Manufacturer	No
Size	One Size
Style	Classic
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Item Package Quantity	1
Number Of Pieces	1
Number of Handles	1
Switch Style	Trigger Switch
Special Features	Variable Speed
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Lithium Ion

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