I have an older model Redfield Tracker 4x Tracker Rifle scope with a broken duplex reticle. Any suggestions on how to make or purchase a duplex reticle / reticle cell?

Redfield and Vortex brands make good entry level scopes with good clarity, durability, features and warranties. If you plan on hunting a scope with a low power around 3-4x and a high power of 9-12x with a bullet drop reticle like the Vortex BDC would be a good choice.

shim the rear base.

look on ebay

this is not uncomon jack up the frount of the scope with a fuw strips of 35mm film if you can this will lower the point of aim a lot at 100yds,,,you may need to let off the screws and fit a thin washer/s under the scope to lift the frount up

It doesn't sound like anything's broken, it sounds like the scope has shifted in the rings, as you said "they are not straight up and down anymore", which won't effect your accuracy at short ranges, but if there's long ranges (more than 100 yards) you're going to be off some.
You can loosen the ring screws until the scope will turn, either 2 or 4 screws that hold the two halves of the ring together. There are numerous tools to help you align the crosshairs, but when I do this job I just square-up the reticle (crosshairs) by looking at the center of the reticles and let your eye follow the bottom crosshair down and make sure it is centered on the back of the bolt or receiver. If you need help doing this job, take it to your local gunsmith, he'll be able to square these up for you and boresight it.
Hope this helps, Mark the Gunsmith

I'm not sure which model you have but the most common battery location is under the reticle switch on the ocular lens housing, you have to hold the base of the switch with one hand and turn off the cover with a coin in the other hand. The most common battery for these scopes is a CR2032 button style battery.
Hope this helps, Mark the Gunsmith

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If you have Leupold/redfield style windage adjustable baes you just need to move the windage adjustments. If you don't have these, I would recommend you take your rifle to a qualified gunsmith and have him remount and boresight your scope with this style scope base(s) which should run you about $80.00
hope this helps, Mark the Gunsmith

From your short description, it sounds like the Horozontal (the ELEVATION) reticle is canted to the left. If that IS the case then do this;
Sand bag the rifle on what you know is a level and firm surface. The rifle MUST be level itself. You can use a small level to determine this.
Without moving the rifle, look through the scope and determine if indeed the horozontal or ELEVATION reticle is indeed canted. The reticle should be LEVEL in relation to the ground and the rifle itself.
If it still appears to be canted, loosen the set screws of the scope ring caps (Not the scope mounts) and while looking through the scope, gently rotate the barrel of the scope clock wise until the Horozontal reticle appears to be now level. Re-tighten the scope ring caps and look through the scope again to make sure the Reticle is still 'level'.
You must now make sure that your scope is still 'zero'd'.

IF the issue is something other than what I have assumed from your description, please send me a msg. with more detail and I will be able to resolve whatever issue you are having. Include the 'Brand and model', plus the power of it, and the brand/model/cal. of the rifle the scope is mounted on.

Good luck. :)

Problem solved. Redfield had all the size information I needed and mounting the base was a breeze.

I own a Redfield spotting scope the model year is between the 70's to 80's and I need to find a manual for it. But I was Wondering if you could answer a question there is a crossair, then there is another one right above that, then there is a loop on the bottom right hand corner. There is also a yard marker that starts at 600 and goes down to 100. Do you know what it is and how to use it or what the purpose of it is if you could help me that would be great. Thank you for all your help..Joshua Gambler