Put together the X + Z gantry.

• 8 X T-Nuts
• 8 X M5 x 10mm bolts, i used the pancake heads
• 8 X Slot Washers ( washers !)
• 1 X 250 mm C Beam

Plate onto the 250 mm C Beam

Add the 10 mm M5's, some of them go into the large holes

I added tape over the heads to hold the bolts in place.

Now add the washers.

loosely add the t-nuts, just enough to hold them in place and align them like this

Insert into 250 mm C Beam

I squared mine off with a mini machinist square

And tighten down the M5 bolts, i did a couple snug then tap gently with a soft non marring hammer, and checked it for squareness as a i tightened it down.

Add it to the 500 mm C Beam

Adjust the eccentrics so they are nice and tight, so you have trouble turning the wheel by hand, check squareness and movement so there is no slop, make sure all the wheel nuts are tight