The inserts that were cracked I used a bit of superglue on and they seem OK. AFAIK there is nowhere to buy arrow inserts, but I could be wrong.
I cleaned all my inserts up with wet and dry, right down to 3000 grit.

As for how the inserts go under clear, I guess one of us is going to be the first to find out. 

I think the price was good, my playfield had massive wear down to the wood  all boards there but the display was buggered.
Decided to get a new one and done with.