The only way for me to get those perfect circles and straight lines is using a Ruler. JUKI has released a new starter kit for your longarm. A perfect way to start using rulers. A great set and instructions for creating designs.
JUKI Longarm Rulers Part # MQT-QR_DRULER Check with your local dealer.
A great addition to go with your Ruler Base, a must have if you are Quilting with Rulers.