... measured some Peco bullhead and it's 1.55mm. Sorry I don't have any other measurements to hand. The other dimensions are not critical. Multiply them by 1.75 for 0 gauge, or whatever is convenient. Yes, 3-point gauges are used to create gauge-widening. If you use Mr. Pythogoras you get a much longer gauge than most folks use. Generally they settle on some gauge-widening being better than none, using a shorter gauge. Here's the drawing for the 00-SF 3-point gauge: 00_sf_3point_gauge.png The length there is 30mm, so for 0-SF I suggest 50 to 55mm. Brian Tulley can tell you where he is getting these made. regards, Martin. posted: 13 Jun 2008 21:07 from: BeamEnds I've sent the info to the potential maker for him to give yea or nay on actually going ahead before getting definate quotes. Cheers Richard Parts of Templot Club may not function unless you enable JavaScript (also called Active Scripting) in your browser. Templot Club> Forums> Templot talk> ...