<html> <body> Hi, Jon, At 12:24 PM 12/29/2006, you wrote: <blockquote type=cite class=cite cite="">A while ago I inquired about replacing the frame for a D. Someone said that there was a dimension change between the bass and tenor at one point.</blockquote> They may have been referring to some fairly minor changes that seem to have been the result of changes in the plate between manufacturers.  These have mostly been spacing issues.  I do not think that there have been any official changes in the scales (at least of the magnitude that would make a difference here) since their introduction. <blockquote type=cite class=cite cite="">I called parts and Chad never heard of such a thing. A post to tech service is unanswered.</blockquote> ...not surprising. <blockquote type=cite class=cite cite="">SO. Here are the dimensions for this rail. If someone knows if this is the current execution, please let me know. Measurements between screw holes on hammer rail: A0 to F2    12.5" A0 to C8     50.75"</blockquote> I think this is still correct.  To be sure, I would suggest getting in touch with Chris Robinson. <blockquote type=cite class=cite cite="">I was hoping to hold out for the Overs Action to install but the school is too antsy to wait.</blockquote> When is that due out? <blockquote type=cite class=cite cite="">Alternatively, why not install new brackets with flat metal rails with all their benefits. </blockquote> That is certainly one solution. <blockquote type=cite class=cite cite="">And where would one acquire blank rails and appropriate brackets?</blockquote> Possibly Renner. Best regards. Horace </body> </html>