I went through all the scale settings on every object connected to the oar,  the oar itself,  the lot  - nothing was showing. (And if it was,  I deleted it! Same issue was still happening. 

However,  I will check your suggestions tomorrow,  and fingers crossed,  that resolves it...!

Thanks for the input  - as you say,  it's quite likely I still missed something...

Thanks everyone!! Every response helped,  I've now got it working,  and I  can move forwards with my project! 😊

This was the biggest hurdle for me  - but I'm certain it won't be the last...! 🤣

Thank you all!