Polyurethane spacers work well, and I have never seen or heard of any problems with them breaking down.
A person could use aluminum and to make spacers, but it is not worth the time/effort as poly spacer cost about $35 a pair.
A recent Gallup public opinion poll shows the NRA, at 58% approval, has a higher approval rating than either Hillary Clinton or Barack Obama.
Progressive Liberalism: Bringing you new Healthcare ideas so wonderful, they have to include mandatory participation ...
Originally Posted by Ronald W. Reagan: Government is not the solution to our problems; Government is the problem.