Rita, it's nothing to do with software!

It simply means that your servo levers (etc.) must be free to move smoothly, without any points where they bind or stick. These kind of systems use as litle power as possible, and if you 'stall' the servo motor by something that is too stiff, it will draw more current, hence waste power and/or cause overheating by the excess current drawn.

Trust Dusty, I know what I'm talking about! :-)

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Note added at 3 hrs 10 mins (2005-12-15 09:39:16 GMT)
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Allan, you know I respect you far too much to be picky, but my peer comment was just to point out that 'hard point' is such a general term, it's easy to find it in all sorts of refs. that apparently associate it with a topic, where in fact there is little or no actual connection.

Your 1st ref. is referring to hardened tips on test probes (nothing to do with servos)

2nd and 3rd refs. appear to be referring to reinforced moutning points in modelling (again, not a lot to do with the actual servo action itself, or electronics)

and the 4th Wikipedia ref., comprehensive though it is, really is talking about a computer hardware kind of situation (which, despite Rita's instinct, this is NOT), and again, nothing to do with friction in servos.

See what I mean? :-)

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Note added at 7 hrs 22 mins (2005-12-15 13:50:59 GMT)
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CB has found the term from the gloss; although MM's suggestion of 'hard spot' was accepted by that Asker, I note that other answerers also suggested something around 'sticking', and I particularly like Parrot's suggestion of 'resistance', even though you would have to 'massage' this a bit to fit it in your sentence; maybe "...take care that there is no resistance in the controls..." or "...the controls offer no points of resistance..."

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Note added at 1 day 2 hrs 19 mins (2005-12-16 08:47:38 GMT) Post-grading
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Another word that could be useful is 'bind' -- "...make sure controls do not bind at any point..."

Although your servo syystem overall may of course involve software, Rita, it is perfectly clear from the context given (power supply / regulators / overheating...) that here they are purely and simply talking about the electro/mechanical interface of the servo, and sticky points and overheating have nothing directly to do with the software at all...