I went for 200mm discfor portability . A lighter plate moves more on impact So abs0rbs less energy for craterng. As said its not so good When I miss! A big piece of paper on plastic corfUte is best for that.
It needs to behung from something stretchy . I've used old Climbing rope, I use a tight figure 8 Knot fixed by mild steel bolt and big Washer on the back of the plate which gives a nice down angle.
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