Subcontractor Threatening to Place Lien on Property

[Cory Iannacone]

One of my contractor's subs called me to tell me he was going to be placing a lien on my property because my contractor stiffed him on a $1,000 payment for work performed on the house.  I am still holding a final payment of $5,000 to contractor and told him I can get him his $1,000 out of that final payment.  2 questions:

1. What is the best way to ensure there are no other subs out there who have been stiffed and would try to place a lien on the property?

2. More generally, anyone have advice or input on how to best handle the situation?

Thanks in advance!