Dougdeacon,
The Tri Plainer WAS at the end of the slots. At that point,realizing we could do no more, we decided to see what the performance would be. We played with the tracking force, vta, and cartridge loading until we had it zeroed in, or at least, thought we did.
Since It had been years since I had vinyl in my system, the sonics overshadowed my desire to get it perfect. Not until I noticed the shaking, did I think a serious problem existed.
Based on your replies, I will tell Sota to send an undrilled armboard, as I have no problem whatsoever in drilling it properly.
Thanks guys, Ken