Handwash Bottle Adapter

There's always some handwash left in the bottles due to the tube not going right to the bottom. This is an adapter to screw both bottles together so the remaining soap can be easily left to drain into the new bottle.

It's for Imperial Leather Handwash 300ml bottles. Barcode/UPC 5000101199363

https://www.imperialleather.co.uk/type/hand-wash

Edit: Added screenshots of the coil I used to make the threads. I used a coil rather than a thread because fusion360's thread tool is limited to standard sizes. Using a coil allowed me to copy the thread more easily.