sb1 alignment

[spud69]

The most important thing Eternal is to make sure they run true to the BR5 and are 151mm offset from BR12. If you can move the chassis forward a bit, otherwise you'll be off the back of your build table, then draw 2 lines along the outer edge of BR5,6 and mark a line parallel to BR12 at 151mm offset. You can then hang a plumb line from the outer edge of SB1 to get your exact position for the rail. Tack them on with SB2 and check the corners are square.

All the Best.....AndyH