I have one of those cheap Chinese Weishi 1000 timegrapher machines. I've been reasonably happy with it, although sometimes I wonder about it. Tonight I was working on a nice railroad grade 21j Illinois. After cleaning it and getting it back together it was running strong (320-340 amplitude) nice clean lines on the timing machine, and .1ms beat error. The watch did have some major positional errors though, so I took the balance out and removed the hairspring to poise, and also found the dial-side pivot was a bit worn, so I burnished it. When I put it all back I had a beat error of 1.6ms. I kept removing the balance and tweaking the hairspring collet trying to improve, but kept overshooting. So, I removed the pallet, and adjusted the hairspring so that the roller jewel was dead center between the banking pins, looking at the axis of through the pins to the balance center. When I put it back together the beat error was 5.6ms! (has now settled to 4.6, and not changing.) Hairspring collet is tight, roller is tight, roller jewel is tight, hairspring is in the center of the regulator pins. So, do I trust this timing machine? Has anyone else seen this? Or is the beat really that far off?