It is pretty easy to do, if you have the tool!!
Get out your yellowpages. Look in flooring, or carpet. Somewhere in there you will see distributors. Look for one that carries Crain tools. Ask when you call if they have a Crain 820 undercut saw, and if they do, ask if they have the diamond blade to fit it, in stock...
Hmmm? The Crain site is now calling it an 825, not an 820... either or, I guess???
It will be just as much cost as hiring someone. Then you can eBay, or Craigslist it to gain some of your money back.
Forget that part..
Call one of these Crain Tools Distributors
CARPET CUSHIONS & SUPPLIES
11745 Lackland Road
St. Louis, MO 63146
314-567-3491
HYDRAFLOW EQUIPMENT COMPANY
8125 Brentwood Industrial Drive
St. Louis, MO 63144
314-644-6677
JER-AND, INC.
1515 Fairview Avenue
St. Louis, MO 63132
314-426-4500
E. J. WELCH COMPANY
3527 Chouteau Avenue
St. Louis, MO 63103
314-771-7086
SOUTHLAND FLOORING SUPPLIES
2380 Grissom Drive
St. Louis, MO 63146
314-993-8600