a light clicking is sometimes normal. just a noise made by the metal track clips hitting the rails. if its excessive, look at the condition of the hyfax(sliders), check the track alignment and tension as well as the chain tension, look for any broken, missing or bent track clips, check the condition of the track drivers as well as any of the bogie wheels. also look over the suspension components real well and make sure nothing is hanging or broken and hitting the track.
Check the back of the slides when the track clip come off the slide they some time will make a slight clicking noise. You can take the slide end and cut it at a angle so there is not a sharp edge for the clip to come off of.
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