Wow, I only went for 60kg ones.Im going for 260kg sliders. Thats each! Its only a few quid more for them and then i dont have to worry about the stresses on them. The aluminium will fail long before the runner does. Will do some FMEA on the design when I have it all set up so I can see where to put the reinforcing bars to best effect.
Sorry James I seem to have stolen your fred
It's ok, I will rename this thread to "how vilguy showed james up with his expedition draw"
Make sure you soundproof the ali a lot as it will transfer sound