If you want the same pen thickness then all elements need to use the same pen, or different pens with the same thickness.
So the section pen for your handles needs to be changed in your example.
If they are modelled as separate elements you can change the section pen for those elements.
If they are their own handle object you may or may not have control of the section pen in the object parameters. The same applies if the entire drawer unit is one object - you may or may not have control of the section pen in the object parameters - it depends how it was scripted.
Another option is to create an alternate pen set, where all the pens (or at least those used in the drawer section) are all set with the same thickness.
Then use this pen set with the section view of those drawers.
This may not work however if you have more than just the drawers in the section.
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