Colin,
By the time you apply all the upgrade parts you will have an equivalent D4. The basic functions are unchanged. The quality of the D4 Manual is so good that I used it as a model for operating manuals for very sophisticated steel plant operations and steel processing processes such as annealing. I believe you will be very pleased with your low cost purchase. Leigh jigs are anything but cheap.
Regis

 

Welcome to the forum, Colin.

 

Hi, thanks Regis have been on downloaad site and starting to print out manual

Colin

 

Hi James thanks for the welcome have already had some great advice from Regis
Colin

 

Colin, I also have a D1258R, and have the original manual, as well as a manual for the D4.
I can assure you that the D4 manual is much better, and can be fully applied to the D1258R without any confusion. But if you need any specific info from the old manual, I would be happy to scan and email you. Rob in S.Africa

 

Hi, thanks Rob I am just waiting for upgrade parts to arrive may be bending your ear in a short while especially as leigh told me they do not supply the spacers I have to make them myself.Not sure what the spacers are for. He also said I can upgrade the fingers simply by purchasing one finger from them which has an extra hole in it and duplicating hole on my fingers again not sure
Colin

 

Hi Colin - the spacers are for bridging the gap between the tail ends of the guide fingers, when doing half-blind dovetails - I make mine out of beech (any hardwood will do) machined to 1/4" x 1\2" and cut of to various lengths as required by the finger layout you decide on. I have never updated my jig to D4, but I see what the holes in the fingers are for - they appear to accommodate a nylon rod which limits guide bush travel when doing single-pass half-blinds on thinner material - this video illustrates it - Rob
Leigh Super Jigs Single Pass Dovetails - YouTube

 

Hi thanks Rob that explains a lot have just spent the stripping down jig to its individual parts as they were in a state. I bought the jig from an old timer who stored it in an old barn, it was not nice to look at, how ever after I stripped it and refurbished all the metal work it looks as is he never used it, everything is gleaming and waiting for upgrade parts to arrive, just finnished making my square drive screwdriver, they are like hens teeth over here.
Colin