Nice I picked up a few ideas watching you. Thanks.

We are here to share the information and possibilities. I'm glad to hear you find something useful Davey.

Regards

Borko

X-rails alignment
 

For rails alignment I decided to use piano wire method.
I couldn't find wire in local stores, so E-bay offers great stuff.

This is the link:

http://www.ebay.com/itm/304-Stainles...GZJ9AHl1Thx9Bw

and is quite inexpensive.

It's 0.4mm SS304 hard steel wire.

I hope it will be of help for other builders.;)

X-rails alignment
 

I didn't want to drill or tap in main beams for wire supports so came out with this solution. Additional welded metal strips to maintain in place 45 degree strip.

To fix the supports clamps are used.

M6 screws in height adjustable milled channel.

The counterweight is 13-14 kg according to Sag-wire chart.

Is there a reason to prefer wire over fishing line when doing alignment?

Yeah, someone else has already figured the sag measurements for that gauge.

fishing line tends to get stretched and thin in the middle throwing off the datum.