Installed a new firewall grommet and assembled the throttle linkage. Tried it out and when the throttle is depressed there is an air gap at the hole in the grommet. I have the correct grommet of my "67 and I got the grommet from NPD and it is installed correctly. Is there any way to correct this? Thinking about using a little black RTV around the hole to sort of bond the hole to linkage. Thoughts?