tilt pivot bar splitting the wood

I've got a problem with the tilt pivot bar that was originally installed in our WOOD window sashes

they used a pivot bar like Pivot Bar, 3", Product Code: 26-040
they drilled a hole in the end grain of the bottom rail and now they are all splitting....

looking for a better pivot bar/bracket that won't spit the wood

let me know what you think

I can send you pics of the split sashes

here are pics of the pivot bar

this is a WOOD sash

they drilled a hole from the side, into the end grain
of the wood... below the kerf for the rubber bulb seal

When you go to twist and pull the sash out the pivot bar splits the end grain of the wood...

they used a pivot bar which is meant for an aluminum frame sash window

need a stronger bracket solution

help....