I have a little problem. I am building an Rst efi engine. Problem is i lost the end cap of conrod nr 4. So what to do now? I cleaned the garage so i am sure that it isnt in the garage anymore. I think it isnt just taking and endcap from another piston and just bolt it on is it? Cos i have 4 std pistons on the shelf. But those are 3i pistons and not RSt ones