You need a motor lathe to cut your armatures. That way they keep top performance. 100 USD can get you a nice used one these forums or on Ebay. Armatures are about 15USD, after about 6 armatures you have paid for the lathe. If you buy armatures, read as follows:
- 27turn is stock
19turn mild modified
8turn and lower is hot modified
The lower the turn the hotter the motor. Machine is less expensive to buy as hand wound is a premium. Also the Double , triple, and quadruple wound applies to torque. You will learn about later. Hope this helps.