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chiroshi
Hulsroy
Yes of course. Short answer is practice and patience.
My YouTube video making the stem has shots of how I use a powerfile.
Good fillets are easier to file and sand. Improving this take time and/or good guidance.
Sculpt the fillets without digging into the tubes. This is difficult and requires patience. You will become better at reading the shapes with time. I sometimes "matte" the joint with a synthetic wirebrush on a cordless drill. This changes the directions of the "scratches" and reflections allowing me to see the true shape.
Once shaped I start blending the fillets. I have started using the powerfile more and more. This requires that you are careful. I try to orient the file along the tubes. This prevents undercutting.
I will see if I can find time to do a little video on this.
But take it easy. Fillets don't need to be perfect. Better to avoid undercuts than having perfect blends