Bought new Dremel 4000 with flexishaft. Put shaft on but can't switch it on, won't work. What have I done wrong? Thank you!

SOURCE: Changing a bit on my dremel

Depends on the head you have on the tool. If it takes collets, you need to match the collet size to the shaft on the bit. There are I believe 4 different collet sizes.

You have the threaded shaft which is hollow and connected to the tool. then you put the proper sized collet inside that shaft and half of it will stick out. This is what actually holds the bit. Next, you put the 'nut' on the shaft, but don't tighten it yet. Put the bit into the hole in the nut as far as it willl go, then back it out about 1/8 inch. Now you can tighten the nut by holding down the button on the front of the tool until the nut does't turn any more. You can buy a 'nut' that works with any bit, no collets used, for about $10. Home depot, Lowes etc or online.

If you're not sure what I'm talking about, you can probably find pics of collets etc. by going to google images.
It would probably pay to contact Dremel or look online for the manual also.

Jim London

• 257 Answers
• Posted on Mar 02, 2009

SOURCE: Cordless Dremel variable speed stuck on maximum

Hi, There are several dealers in London who can help you solve your problem. The following link is has a list of those dealers with addresses and phone numbers:
http://www.dremeleurope.com/dremel/dealerlocator/index.cfm?lang=en-GB
Good Luck to you, this should Fixya!

SOURCE: My Dremel tool motor still works but shaft won't turn?

Here's the email from I got from Dremel (in my case the flex coupling broke):
Inside the tool is a flex coupling and spline driver.

The flex coupling is # 2615294309 and the price is $ 1.25.
This is the hollow plastic sleeve about 1" long with grooves on the
inside, that goes between the motor shaft and the output shaft.

The spline driver is # 2615294308 at $ 1.00.
Spline driver sits on the direct end of the motor shaft. The flex
coupling sits over the spline driver. Spline driver is about 1/4",
hard plastic with grooves on the outside.


Total shipping for orders under $ 5.00 is $ 2.50. Orders over $
5.00 is $ 4.00.


I have provided ordering instructions below.

To order by phone: 1-800-437-3635, Monday-Friday from 7 am to 6 pm
central time. VISA, MasterCard or Discover is accepted.

To order by mail:
Dremel
4915 21st Street
Racine WI 53406

SOURCE: One end of the 225

To use the flex shaft, you need to remove the bit collet. Included in the kit is a nut looking item--mine is silver. It has a square end and screws on to the end of the dremel. It is simlar to the collet, but is slightly smaller. Then you place the square end of the flex shaft into the nut and screw the shaft on to the dremel.
Hope that helps

SOURCE: I bought a Dremel Advantage

sell it to me... im on my third one and cant find a new shaft......
i make mushroome sticks.....not happy at allllll....
dremel needs to make them again now.............im out of luck..
model 961 hasent been produced in10 years!!!!!!!!!!******..
still cant finf replacment parts.........t-bone..