Looked at that Target Alpha that has been on sale for over a year and it wasn't as good as the pics.
It was poorly presented for the asking price as it hadn't been cleaned, been sitting for a while! Had corrosion appearing on the metal parts and the door had been jimmied open at some stage also the flippers were weak.
Still a nice machine but if I was selling a machine for top dollar I would have tried to make it look like it was worth it and playing ship shape! If you are spending that sort of money you should not need to spend or do a thing to it so I walked away.
Ended up buying a nice Sinbad for half the price which was also HUO and really happy with it.
If the Target Alpha is your Grail machine then this is a good example and wouldn't take a lot to have it spick and span but the price is high.

http://www.ebay.com.au/itm/Pinball-Machine-Target-Alpha-1977-In-Great-Condition-HUO-MAKE-AN-OFFER-/321896307877?hash=item4af283dca5:g:vywAAOSwj0NUeBQD

Here is the guy's profile link, his name is Tony if you want to have a chat to him about it.
http://aussiepinball.com/index.php?action=profile;u=85

Cheers: Brettski... :)