yes the yoke on them is a little cranky
it heat's up and melt's itself off of the tube
what we use is :black-silicon:,make sure it is black
as it is the high heat stuff
once yoke is in place
u silicon 4-1/2"-2" beed's
at the top of the yoke where it meet's the bell of the tube
this will hold the yoke in place
trick here is to just make sure the yoke and converg are set
turn unit off,and without shifiting the yoke
place the 4 beed's and let sit for and hour
and then test run,it should be fine and your good to go for another 5 year's
ed