The focuser on my Meade DS-70 telescope is broken, the problem is the rack part of the rack and pinion is missing several teeth in two sections. The rack appears to be part of the inner tube, so replacing the rack does not appear to be possible. One fix I was thinking of was a typical bar/pipe clamp except there are a 2nd and 3rd set of clamps in place where the pads would normally go. I could then clamp the 2nd & 3rd clamps to the inner & outer tube and then use the main clamp to adjust focus. However I can't seem to find anything like this online.

Only Meade will have the part. Contact them here:
http://www.meade.com/support/index.html

Contact Meade customer service here:

http://www.meade.com/support/index.html

You may be able to buy a replacement focuser. If not many telescope retailers sell replacement focusers.

You can possibly buy another focuser from Meade here:
http://www.meade.com/support/index.html

Orion Telescopes also sell focusers here:

http://www.telescope.com/control/telescope-focusers

Meade may sell you another focuser, contact them here:
http://www.meade.com/support/index.html

You can also buy a replacement focuser from several on line retailers-

Here is one-
http://www.telescope.com/control/telescope-focusers

You will need to buy another focuser like one of these.

http://www.telescope.com/control/accessories/telescope-focusers/1*25-inch-orion-basic-rack-and-pinion-focuser

http://www.telescope.com/control/accessories/telescope-focusers/2-inch-orion-crayford-style-telescope-focuser

You can buy a new focuser here:

http://www.telescope.com/control/category/~category_id=focusers

Call the meade service center.
(800) 626-3233

It might be easiest to see if someone is selling one on Craig's list or ebay.  You might be able to find one used where the telescope is OK, but the motorized drive is broken and replace the telescope.
Here is the contact information for Meade:
Contacting the Customer Support Center     Customer Support representatives are available to handle your calls and letters regarding any Meade product 7:00am to 5:00pm Pacific Standard Time, Monday through Friday, excluding holidays. To contact the Meade Customer Support Center, please write, call, or fax. Our information is as follows: 

Meade Instruments Corporation
27 Hubble 
Irvine, CA 92618

(800) 626-3233 (U.S.A. Only)


You could try calling them and see if they will sell the part you need for the focuser.  The focuser is called a rack and pinion focuser.  From your description it is hard to know if it is the long linear gear on the draw-tube (the part that holds the eyepiece) or the gear on the shaft of the focusing knob.  You will need to be able to describe that to them.
I hope that helps.

You can send it to Meade -- but very expensive-- or you can buy a complete new focuser from these people-

http://www.optcorp.com/

http://www.telescope.com/control/main/

You may need to buy a generic focuser, if you cannot get a replacement from Meade service;
www.meade.com