Double Bass Yamaha SLB200 Endpin Trouble

Jan 24, 2018
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I just bought a used beautiful Yamaha SLB200. It just arrived today and I immediately began to assemble its frame and insert the endpin, so I could adjust for my height. However, the endpin just goes in about 3/4", then stops. The endpin stopper only loosens about a half a turn and I don't want to force it, fearing it might break.

Has anyone else encountered this?

Thanks in advance for your responses.