On a fancy I just ordered myself a Triton T-square accessory for my tracks, there's also an adjustable angle guide available but I just wanted something for quick and easy breaking down of panels. I'll be interested to see its squareness when it turns up, for my purposes it just needs to be 'adequate', I'm not expecting Woodpeckers standards of square.
I ordered mine for £22 all-in from Bamford Trading,.

I ordered mine for £22 all-in from Bamford Trading,.