i did note on strip down that there wasnt a 'stop lever ' fitted as well. i guess i shall have to just carry on reassembling it sub assy by sub assy and see how much works and what dosent. The other rounded spring i'm not sure about, though it definitely came out of the movement somewhere. I thought all i needed to do was order a new balance complete, clean, lube and reassemble it. i guess i am now going to find out the downsides to starting with an old movement from a scrap box. Thats definitely the spring i took out of there, but. I shall pop in and get some in the next day or so and bend one up. but defo thinner than the 0.54mm spring thats in there now. but the local model shop say they have some 0.35mm piano wire, marginally thicker than a 0.28mm guitar string. Thanks for the suggestion Hectorlooi, I dont have a geeetar, wish i could play tho. Scope mode to aid in diagnosis of various watch faults.Simple, uncluttered, fixed-size display (1024圆00).Automatic rate detection for common rates.Aggressive noise filtering in the software to keep the hardware simple.Automatic signal and noise level determination.Rate determination using linear least squares, which gives a more meaningful reading than just naively averaging the rate.Horizontal 'paper tape' mode with sub-pixel vertical resolution that can show fluctuations that are too small to see on a typical stand-alone timing machine.Numerical display of daily rate error, balance amplitude, and beat error.Here's a brief list of features so far (I have to resist creeping featuritis): Since the scope mode was run after the timing mode, the scope also shows the threshold that was used by the timing mode to detect the start of each tick. Notice how with this movement, they alternate in loudness. In this picture, the software is in scope mode, showing directly the ticks and tocks.

The next picture shows the timing trace from my 'Black Lagoon', a modified Invicta 8926OB with a Seiko NH35A movement (yes, the amplitude is quite low and tends to fluctuate, topping out around 220 degrees - apparently this is par for the course for Seiko movements): Here's the hardware, all home made of course: I may also produce a 'pro' version of the software with more features, to be sold for a reasonable fee. My plan is to eventually write up a detailed article on my web site describing how to build the hardware, and providing a download for the software. I've finally got something working reliably, and thought I'd preview it here. One thing I've been working on over the last few months is my own PC based timing machine. I'm a watch DIYer, having serviced two watches myself, partially using tools of my own making.

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