I've built saber hilts both ways over the years and, these days, I am more in favor of the strip being beveled than not and here is my reasoning. With the Elstree we now have three production related saber hilts with beveled LED strips (assuming it is genuine). The other two being the Vader ANH stunt/RotJ severed hand hilt and, of course, the ESB Vader Hero. I also think that from a build standpoint it makes sense.
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I put this ANH Hero together this summer to keep in the office at work and I experimented with groove and no groove. It is the removal of the lever washer that really makes me prefer a grooved, or in my build notched, strip. I was really loathe to cut into the Rebelscum LED strip I had been hoarding so I tried to get things to line up with an unmodified strip first. After removing lever washer I found the spacing with the strip didn't look right. The edges of the clamp were too far apart. I also found that I couldn't have the lever extended and get the clamp to tighten down enough to for the top half of the flash to lock in place. Then Gregatron noted that you could see the lever screw protruding from the top of the clamp which meant tightening it down even more. Once I tightened the lever another turn I couldn't get the strip to fit into the clamp well at all (I snapped the corner off the strip in the attempt).
Since an unmodified strip wouldn't fit I started experimenting with grooves on a spare strip I had to hand. I first tried to cut it out with a deep groove like the Elstree and found it was too loose so I cut the edges off at a slight angle with a file:
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Once I did this things started to line up nicely with the Toe picture and the strip still provided enough resistance that it was difficult to close the lever but still have everything locked in place. In the intervening months the lever has started to close more -- just like the screen hilt -- so I have to be careful with it.
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I'd like to try again with another strip once Rebelscum starts up production again (fingers crossed). I'm still staring at those photos trying to glean more information from their fuzzy images like we all are.
Cheers,
Dave