That looks very similar to the Apollo I use. To be honest, I’m not certain what stowed position you are referring to, but I think the answer to your problem is to liberally spray some silicone lubricant at every pivot point.
Further, if your arms won’t extend, remove the rubber boots and spray away.
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2021 DSDP 4326 Freightliner
2023 Winnebago ERA 70A
2005 KSDP 3910 Spartan
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