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If the issue is that the connector is too short (very likely, as it seems to be designed no allowance for tolerances), this spring connector might solve the problem:

https://www.thingiverse.com/thing:2829043

I haven't printed it yet, but it's designed to the same dimensions as the original one, and will extend under pull, so I'm confident it will do the job.

Spring Connector for Modular Castle Playset Modules