I have worked on Clausings for many years and the only ones with spring loaded rollers I have seen were the CV series ( not a Colchestor product), maybe he had an old obscure machine. The machines at the research lab were very well maintained but only returned rather poor accuracy and repeatability, so I'd only put them at average quality. Inspect the ways carefully for wear near the headstock. The carriage lube system also was a weak point. The tailstock had spring loaded rollers to ease the movement when unlocked, these fail easily. Sometimes it is hard to tell without actually turning a piece but if the lube pump works and the oil is clean the usually are good.
The worst and probably most expensive repair is replacing spindle bearings if they are bad. There is a flat spring in the apron when broken will cause the feed to disengage when feeding towards the spindle in both x and z. The rapid sometimes doesnt work because the wires from the button on top of the joy stick have broken where it passes through the bottom of the shifter. Shift the feed reverse to neutral if it goes away check the gears they should have app.005-.010 back lash. A couple common problems that seem worse than they actually are, head stock noise caused by the end train gears being too tight.
Blue/white and green/white ones with a model number ending with a D were made in China, these are not as good as previous or newer ones. On the newer Colchestors with the large square headstock, the two tone grey ones were made in England. Hopefully you can run the machine and listen for noise. Make sure the lube pump is working and see how clean the oil is, on older machines the apron (gearbox on the saddle) can get coolant in them causing severe rust if the machine was not leveled properly. 100" and the half nut is worn out so threading will be a problem. Engage the halfnut and try to move the saddle. But most of them are very well worn, on any lathe take a good look at the ways for excess wear near the headstock. How old is it,the old 8000 series with the tapered headstock were all made in England and are rock solid.
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