What i dont understand is how i would tighten it?
theres a big nut on the front of the fan itself (behind the grate) but i cant see anything at the back to actually hold in place so i could even attempt to loosen/tighten the front bolt
Hold the fan blades. The fan is an interference fit on the shaft - if the shaft spins whilst the fan is held still...there's your problem.
Bolt is / may be reverse threaded for extra excitement.
@Howard started
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What i dont understand is how i would tighten it?
theres a big nut on the front of the fan itself (behind the grate) but i cant see anything at the back to actually hold in place so i could even attempt to loosen/tighten the front bolt