Welcome, Newbie1234. I'm guessing that this is a machine that hasn't been cleaned and serviced. I see that you are from GB. Here in the USA we generally recommend cleaning the internals and dried oil with Kerosene, but I believe you call it Paraffin.
I found three sites that talk about taking the hand wheel and stop motion clutch apart and putting it back together.
http://shesasewingmachinemechanic.bl...er-clutch.html 
https://oldsingersewingmachineblog.c...nger-part-two/
http://vssmb.blogspot.com/2012/06/ho...bbed-stop.html
We like pictures. In order to post pictures on Quilting Board, you will probably need to reduce or compress the picture to a
file size that is smaller than 2MB. How to post images can be found at
https://www.quiltingboard.com/attach...020-01-17-.pdf
Don't forget to scroll over to the far right to find and click on the "
Upload" button.
I have found that only the big
red "Reply" button or "
Quote" work to give me the
paper clip icon to work for adding pictures.
https://www.quiltingboard.com/attach...p-location.jpg
Some additional info regarding reducing images at post #4 and images for the scroll and upload button can be found at #5 of
quilt block ID?
Another way to post pictures can be found at
2021/2022, 2.5” Birthday Swap
And how to use an ipad to post pictures can be found at
Uploading photos
Or simply - Make sure pictures are
smaller than 2MB
Click on red "
Reply" button
Click on the
paper clip icon
Click browse - choose picture/s. (only 5 allowed per post)
Once they show up as being loaded,
Scroll over to the right side and click on "Upload"
After the pictures show up as being attached, you can close that window and go back to the screen to finish posting your post.
Janey - Neat people never make the exciting discoveries I do.
Not affiliated with off-site link(s)