In what Version/Edition are you having this problem? I just place my cursor very close to an arc/circle and use the "Q" key. The Line snaps to the nearest quadrant point. I don't need to be directly over a quadrant point.
TurboCAD 2019 Platinum
« Last Edit: July 03, 2019, 02:07:31 PM by John R »
Designer, Deluxe, (Professional, Expert, Basic), Platinum
Windows 10 Pro (1803), 64-bit