You can find the vintage proprietary blades that came with the razor fairly easily and, if you're into that sort of thing, you can strop and use them over and over. Personally, I'd rather use a modern blade, so here's how it's done. Note, this was not my original idea. This was being done long before I ever discovered the Enders Speed Shavers/Razors, and I've been unsuccessful at finding the origins of this "hack".
First, note I'm only familiar with the "Speed" varieties of the Enders razors. I have both the "Speed RAZOR" and the later model "Speed SHAVER". The head geometries of both variants are the same, but the cut-out on the earlier "RAZOR" is semicircular where the later "SHAVER" models have an angular cut-out. The proprietary blades work with both versions and the following adaptation is the same. Additionally, I find they all shave the same accounting for the weight and handle size variations.
Here's how to use a modern blade: You need only one vintage Durham-Enders Speed blade. Before you do any modifications, you may benefit from loading the native blade to allow you to get a mental (or even physical) picture of the intended stock blade exposure.
Then, blunt the edge of the Speed blade by grinding it down by at least 1 mm. If you have the time and patience, you might as well take the whole bevel off, but it's not required. This will be evident in practice, but the goal is to shorten this old blade to allow the modern blade to hang over into the correct blade exposure space.
Now, you need a modern blade. My preferred blade in this application is the Schick Proline B-20. There are likely other injector-type blades that fit, but I haven't explored them. I can say that my all-time favorite blade, the vintage Personna 74 injector blades do NOT fit as they are just a hair too wide. This obstacle along with recommendations from the SE shaving community forced me to pick up the Prolines, and I can attest they are very nice, comfortable blades in their own right. They don't last as long as the Personna 74s, but then again, what does? The Proline B-20 is a fine option for the Enders.
You then place the Proline in the head using the exposure you choose. This is more easily achieved by flipping the razor upside down. There are text and groove landmarks in the head that conveniently allow you to keep the blade straight and achieve a good degree of consistency in exposure. If you find that your clubby fingers keep bumping the unsecured blade from its position, try wetting the blade and the razor head. The adhesive effect of the water will help secure it until you've locked it in as demonstrated further.
Once you have the modern blade where you want it, slide the blunted Enders blade behind it. After you've started sliding the blunted Enders blade behind the modern blade, you may find it necessary to flip the razor upright and inspect it face-on. If you find the insertion of the Enders blade is moving your modern blade's position, let your thumbnail act as a stop. Then you can continue to insert the Enders blade until it clicks into position. At this point the modern blade is secure and will not move while you're shaving.
This sounds like more trouble that it's worth, but it's actually quite simple. Once you've made the blunted "shim", you don't have to do that again. While sliding the Proline into place may sound precarious and random, as stated there are landmarks in the head that can be lined up visibly through the holes in the Proline. Once you've done this a couple times, you won't have issues with moving the Proline while the Enders is being inserted because you will have figured out the nuance that prevents this.
Still sound like a lot of trouble? Well, since I've been going back and forth between the green, red, and yellow razors using the same blade, I've gotten accustomed to it such that I can load the blade at least as quickly as I can load a 3-piece razor.
@Jayaruh demonstrates the blade adaptation here:
@Jayaruh has also dabbled with adding "bumps" to the blunted Enders shim with J.B. Weld, thereby making it an effective blade carrier and removing the guessing. He has some other tips as well, but ultimately, I'm quite happy the aforementioned method.
In terms of performance, these razors aren't just pretty. They are light-weight by nature, yet well balanced across the board. I hold these in high regard, and place them in the top 4 of my all-time favorite shavers.
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