Great effort for having a go at it.
Be interested in having a look at the video if you’ve got a link to it that you could post please? [size=78%]Need to get around to doing mine at some point.[/size]
Sorry, I can’t help with how soon you’d need to be changing the shims, in order to avoid any damage, but I’m Sure somebody far more knowledgable, will be along soon to answer your query.