Slack string on linear slides when using a different slide lengths

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The discussion centers on issues with maintaining string tension in a setup using both 400mm and 300mm linear slides in a robotics application. The 300mm slides are mounted in a way that may affect the overall extension and tension. Participants are uncertain if the differing slide lengths contribute to the tension problems. There is a request for more detailed images to better understand the arrangement and mechanics involved. The conversation emphasizes the need for clarity on how the different slide lengths interact within the system. For more information on the FIRST Tech Challenge robotics, visit https://www.firstinspires.org/robotics/ftc.
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TL;DR
String slack possibly because of different length linear slides?
We have multiple 400mm length linear slides as used in the FIRST tech challenge robotics. However, our very last and innermost set of slides are 300mm length mounted such that they are not closer to the end of the extension (the black slides in the picture). We are having a lot of trouble keeping the string tensioned regardless of if we use springs (not currently in the photo). We were wondering if the two different extension length slides we used would contribute to this but we’re not sure why that would be. I would love to elaborate on this further but I’m not sure what details would be important.
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Quietrabbit said:
We have multiple 400mm length linear slides as used in the FIRST tech challenge robotics.
Please provide a web link to the "FIRST tech challenge robotics", so we can see how the slides are arranged.
 
Quietrabbit said:
... We were wondering if the two different extension length slides we used would contribute to this but we’re not sure why that would be. I would love to elaborate on this further but I’m not sure what details would be important.
We neither.
Please, show us the whole picture in more detail.
 

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