I kind of need a little help

So, what is the thing that people use to put on a sentry, and it fits the circle part of its head? I tried to find a guide or something, but none of the ones I have seen, are the ones I need. What do I use?

The circle does not go as big as I need it to be. :frowning:

You can just change the size of the barrier.

I need the barrier to be like an oval. How do I do that?

use multiple

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