Thank you, John,
Thanks to your help (and Henry), I think I have it! I have attached the file containing the barrel with all parts in place, is this OK?
On a side note, one thing I have noticed in all versions of TC (since TC7, my first), is that when moving any object which has curved in 3-d, it really doesn't like it, and can be very slow, even with a very powerful PC (8700k, 32GB RAM, 1080TI GPU and NVMe hard drives) ! This has always been the same, is there any trick to get around this?