I tried to edit the drawing but without success.
I managed to change one dimension but not the other, and that on just a rectangular plate with a rectangle of holes for screws.
The crosshead body is much more complicated, and the faults were the width of a recess and the layout of the corresponding screw-holes.
I had already made the real components but mis-measured them for drawing them so I can design their surroundings.
I may as well say, “To Hell with formal drawings”, and just use those already done as literal “3D models” plus rough pencil sketches on the backs of the ME&W magazine address-sheets. As I have with some components already.
Videos are very variable. Paul Tracey recently sent me very good ones he’d made for TurboCAD.
(TurboCAD’s manufacturer, IMSI, has contracted making tutorial videos to another company. I viewed them but it was obvious the contractor simply publishes a few random ones from three separate series. They are presented very well, but do not transmit to their full lengths [file-size limits?], and the overall result is poor. My impression is that the contractor is purely a third-party technical publisher who does not fully understand the subjects, and with poor oversight from IMSI. IMSI itself now belongs to some outfit not necessarily CAD specialists.)
I did also study the introductory material for Alibre, used in its MEW series.
Generally though, I had been put off a long time ago by “tutorial” videos that were hard to follow; more demonstrations of expertise than instructive.
Also, I find a static manual, printed or in .pdf form, far easier to use than moving pictures anyway.
While I am very grateful for all help, I don’t want to rely on deeper informal tuition gambling other people’s valuable time on my abilities. Allegedly I once had an unusually high IQ (by NHS record… even the experts can make mistakes!); but I know I was always a very slow learner with unpredictable but low natural limits for any subject. CAD is no exception, and not alone.
I don’t want to adopt yet another CAD system I could no more learn to its full advantage, than TurboCAD Deluxe or Alibre Atom.
Those two differ considerably, and each has its own strengths, limits and level of difficulty quite different from its rival’s. Although I can overlap them enough to be useful, that is not ideal.
If I could, I would use just whichever is the one easier for me, for both single items and assembly drawings.