[TowerTalk] Yaesu G800 Slipping on 25G Rotor Plate

[Rob]

Hi Group,

   A couple questions. I installed a G800 in a 25G tower with a thrust 
bearing top plate, that turns a JK Navassa 5 beam for a friend. At the 
beginning and end of rotation, the torque from the beam was causing the 
G800 to twist slightly on the plate, most likely from the bolt holes 
being  larger in diameter than the bolts. Apparently the grinding sound 
was a bit unnerving to the operator. So with a short wrench so as not to 
be able to easily strip the bottom casting, I incrementally and 
carefully started tightening the bolts to get to the point where it 
would not slip. So, you are probably smiling as you know what happened 
next. Yes, I stopped after stripping the first bolt hole in the casting. 
Fortunately, a new bottom casting is not that expensive from Yeasu and 
is on its way. So my questions are:
1. How difficult is it to replace the bottom casting on a G800?
2. Any thought on how to install the rebuilt G800 and not have it slip 
on the plate? Maybe something as simple as putting a star washer on each 
bolt between the plate and the bottom casting?

Thanks,
Rob K6DQ