solid comp IanT SketchUp2017.skp (799.0 KB) This is 2017 version file at a guess of the version you may be using or later, please complete your profile information with SketchUp version to make it easier for others to help you.
I managed to get the component solid for you maybe that helps in some way, I think the main area of problem were on the internal corner part where the blade sits. There seemed to be some faces out of place, some other small problems too. I used the Dave Method on a scaled up copy to make the corrections because of the small faces involved with this. I have moved the component origin to the model origin, that makes sense to me, but you can move it again if you wish.
Also you are using Sketchup Layers incorrectly, the geometry were on a combination of layer 0 and the other layer that were in the file. The screenshot below shows a blank layer field meaning that the selected entities are on a mixture of layers…
I deleted the second layer, as I thought it weren’t needed anyway for this. All of the geometry of the component is now on Layer 0 as it should be.
In SketchUp, leave layer 0 the active layer at all times, so that all geometry is drawn on layer 0. Only Groups/ Components are assigned to layers. See the help files for layers https://help.sketchup.com/en/article/3000122
Hope this helps in some way.