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One is installing no shaft props. Specifically T76 props. The prebuilt I got came with washers, 4 O style and 4 C style. Where do i put these when installing the props?
The second question is when charging Lipo batteries is it safe to use xt30-xt60 adapters on a balance board?
Also, I realized in the title "to" instead of "two" is wrong. Working and trying to type this out somewhat quick.

Can you  post a picture of the parts you are talking about?
  Be careful putting bolts in t-prop holes because if they go in too far they can hit and short out windings.

xt60-xt30 adapter should be fine.

I'm not sure what those washers are for, what pre-built quad is it?