I have just checked mine and I have the large rubber seal with a hole in it in the cap but no nut or washer holding it in place and no hole in the cap for a bolt, is this normal?
Check out this cap for what yours should look like after you've modified it. [Planenut's photo I think.]
![[Linked Image]](https://tm-img.com/images/2022/02/12/Late-Oil-tank-cap-1-Planenut.jpg)
