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Hi everyone! I just want to start by thanking you all, as most of the times I have an issue this forum is a great resource in which I find many answers without having to create a thread Since we use Acad 2014, some of my coworkers have started using viewbase style views. Since we have standards regarding lineweights, I've tried to find in vain a way to set the lineweight default values for the viewbase layers (MD_Annotation, MD_Hatching...) when CAD create them. Since i couldn't find any way to give them default values upon creation, my only option was to pre created on our templates all the layers generated by viewbase. The thing is that when someone purge a drawing prior to create the first viewbase, (which is 95% of the cases - designers make the design/3d model, purge, then the draftsman takes over the project to make the fab plans) the MD_ layers get deleted, and when they are generated again all the lineweights don't match our standards. From my perspective, I now have 2 options. 1- Beat the hell out of the designers whenever they purge the layers (which is not very nice..) 2- find a workaround (which I did, but I would need some help to achieve my goal since I'm not really acquainted with reactors) basically what I need is a reactor (in acaddoc.lsp i'd guess?) doing that: reactor@plot: verify if layers (MD_Annotation, MD_Hatching, MD_Hidden, MD_Visible) exist if not: resume plot if they do exist: check lineweight setting to ensure they match our standards (MD_visible = default, MD_hatching = .05mm, MD_hidden = .13mm, annotation=default) if true: plot if not: change values then plot If the MD_ layers do exist, i'm not sure if I should bother looking at their lineweight value to compare them with our standard, to change their value if they dont, or if I should directly set their lineweight value if the layers exist. Thanks in advance for your help Cheers, Jef!