Dean - I've ordered from them plenty of times - they stock 1,000 of old gottlieb and "hard to get parts"... I assume you have checked out Mark and Greg's site - Maybe the part is local ?
First and foremost - Create an account with Steve via email. You do this with your first order. He will send you a quote.
Then you go to the post office and write up a Western Union Money order for US Dollars to "The Pinball resource", with your copy of the quote in the email printed and sent..
Wait for the package - 2 weeks, usually - if sent via USPS.. UPS is quicker, but more expensive. You sign for the parcel when it arrives.
For every order after the first - He sends you the parts, and you pay after you receive them...
When you place your order with Steve - Make sure you have the part numbers handy..
This time of year is a bad time to be ordering tho.. Christmas post is a nightmare
It will take longer than 2 weeks.