Drawing Errors and Omissions
Drawing No. 1 The footplate support bracket holes adjacent to the slidebar bracket are too close to it. I had to thin my brackets to fit.
A means of supporting the front section of the footplate is required, maybe two more footplate support brackets either side of the cylinder mounting plates.
Drawing No. 2 By-pass body overall length incorrectly labelled 1.1/8", should be 1.3/8".
Pump and pump stretcher - ignore the 7/16" dimensions and use the 8-hole PCD dimensions instead (0.442" for the 45 degree holes)
Drawing No. 3 The spring mounting holes in the toe of the spring brackets appears to be incorrectly positioned on the drawing and need to be nearer the centre to fit the cast springs. I offered up my springs to the mounted brackets before drilling and spotted through accordingly. Thanks to Alan W. for pointing this one out.
The driver's side wheel fouls the expansion link bracket when the suspension bottoms out. See the "Assembly" page.
Drawing No. 4 Slidebar bracket - the six frame mounting holes are 4BA, not 6B.
Why do these lazy draughtsmen not put overall lengths of components on drawings? Front rod is 9.202", rear rod is 7.265", con rod is 12.208"
Return crank (as drawn) is 2.213" overall length.
The pins joining the front and rear rods need a screwdriver slot in the rear to aid assembly / disassembly.
Drawing No. 5 Sanity check - bogie frames 10.3/8" overall length, 5.3/8" between inner bearing faces
Bogie stretchers - easier to use 6BA bolts to fix, with 3mm dia. holes in frames and 6BA tapped holes in stretchers
Axle boxes - use sealed-for-life bearings, oil channels not required.
Drawing No. 6 Spring sockets 3/16" high
Drawing No. 7 The frame mounting holes of the footplate brackets leave the brackets approx 5/32" too high. I have used 1.243" from the top of the frames to the top of the brackets as the reference size. I have made six of the short brackets and two of the long brackets.
Drawing No. 8 The valve spindle shows 7/32" x 40 thread, then specifies 2BA nuts to fit.
Drawing No. 9 If using the expansion link bracket castings, the driving wheels foul the underside of the castings at maximum depression of the suspension. A cutaway needs to be made in the castings to clear the wheel (see the Assembly page). The fireman's side bracket also needs a cutout to clear the link at maximum throw.
Drawing No. 10 The blast pipe nozzle cannot be made as drawn. It needs to be made as two parts and fitted / soldered together.
Drawing No. 11  
Drawing No. 12A & 12B  
Drawing No. 13  
Drawing No. 14 The snifter valve is shown with a 1/4" x 40 thread in the bore and 3/16" x 40 on the base. This should be 3/16" x 40 at the top ( with a 5/32" bore) and 1/4" x 40 at the bottom to fit the 1/4" dia hole in the smokebox.
Drawing No. 15 Now drg no.15 but still printed with drg no.21 in the bottom right corner.
Drawing No. 16 I have been advised by Alan W. that drawing 16 refers to the tender but this may be a legacy from the Perrier drawings. My set, redrawn by Gilbert, uses the Warnett drawings (see below).
Drawing No. 17  
Drawing No. 18  
Drawing No. 19 The smokebox footplate is drawn with the side mounting flanges projecting downwards. They were upwards in full-size.
Drawing No. 21  
Drawing No. 22  
Drawing No. 23  
Drawing No. 24  
Drawing No. 25  
Tender One correspondent, Don, has reminded me that the Timken covers from Blackgates are smaller than prototype. Adam Cro (see the Links page) sells a more accurate version. The look of the axle boxes can be much improved also.