Yes I do know that and it is a good tip. I use metal all the time and have shown many pens here with mostly aluminum inserts and have had no problems since I switched to using System3 T88 epoxy glue for my glueups. Iy small pieces of acrylic. I am a little scared of that one. I need to find a kit that is one tube but long enough to incorporate the desin so it fits uniform on the tube. Need to get that one too.
I like to work with only wood of different colors, but last time i was thinking in adding some brass or aluminum to add a touch but I gave up that idea because I was afraid that it could stain the wood, but I see your pen is pristine and you are using a white wood. How you do that?
I have a pen in purple heart and I realized some darken like dirty in the finishing and it was because of sanding, no matter how much I tried, so in the last ones that i made I used many colors including purple heart (showed in my pictures) I decided to use a very sharp skew instead of sanding but then it left a very smooth and shiny surface and maybe it's more recommended to use the skew as a scraper so it leaves still a smooth surface but with better gripping for CA glue, so I did it that way skew, CA and Micro mesh and it turned well.