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"Star Testing Astronomical Telescopes" by HR Suiter has all the details.
The "star" should be ideally x20 the telescope focal length and the size of the reflective ball can be 20-50mm to give a suitable "glitter" spot.
The artificial lamp (usually using a quartz halogen bulb) placed a couple of feet to the side of the reflective ball.
Try what you have and see.....
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