It's white metal the vibration will cause them to work lose they are just pressed in to begin with. You could clean it off good and use some JB weld to hold it back in.
Think you are going to find that 5 foot is way to big for your machine I have a 42" on my 35 Kobelco and it is almost to big the problem is when you are extended out. The 42" from Rutt I have only needs 15GPM and it will cut up to about a2" tree.