Right hand, left eye dominant

Hand drill is fine.  There's enough metal underneath the glass that you can drill a 3.5mm hole, tap it out to 4mm, and bolt a piece of polycarb (I use 4mm, drilled and tapped to match) straight on.  I was a little paranoid about conducting impact through to the lens surround and have 4 layers of bicycle inner tube between the polycarb and the sight to keep it slightly clear of the lens surround, but that's probably unnecessary.

When I do the beige (mmm, beige) one that's currently on the way to me, I reckon I'll do 2 bolts to stop the polycarb rotating, although it's not a huge problem.

 
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Rogerborg said:
Hand drill is fine.  There's enough metal underneath the glass that you can drill a 3.5mm hole, tap it out to 4mm, and bolt a piece of polycarb (I use 4mm, drilled and tapped to match) straight on.  I was a little paranoid about conducting impact through to the lens surround and have 4 layers of bicycle inner tube between the polycarb and the sight to keep it slightly clear of the lens surround, but that's probably unnecessary.

When I do the beige (mmm, beige) one that's currently on the way to me, I reckon I'll do 2 bolts to stop the polycarb rotating, although it's not a huge problem.
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Maybe I'm just tired, but struggling to picture this, any chance you can post a pic?

Cheers

G

 
Please excuse the flashy shine.  You might want to use thinner polycarbonate, but I like a meaty 4mm.  There's a rubber sandwich in between the sight and the polycarb holding it proud of the lens surround - that's that part where I'm being paranoid, it might be totally unnecessary.

MB6Y80n.png


 
Thanks, I've got some 2mm Polycarb, will see if I can rig up something similar.

Cheers

G

 
I erred on the side of caution, but 2mm is likely fine, it's tough stuff.

 
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Samples are a smart move if you don't want to do too much work.  I had to do round covers to fit some sights exactly though, so just went for an A4 sheet of 4mm for £3.25 https://www.ebay.co.uk/itm/361195046704

4mm really is more than sufficient, and cuts fine with a fine tooth metal jigsaw blade.  A hacksaw might take some time to get through it, so I would agree with going for 2mm.

 
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Quite happy with how that came out!

Used M3 bolts, pro-tip, drill the poly-carbonate first, then mark and drill the aluminium, would have been a lot easier with a drill press!

View attachment 34024

 
Rogerborg said:
When I do the beige (mmm, beige) one that's currently on the way to me, I reckon I'll do 2 bolts to stop the polycarb rotating, although it's not a huge problem.
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Heh, oops.  I've since realised that a single bolt in the middle lets you rotate the polycarb out of the way in order to clean it and the sight.

 
I bought a sample piece from ebay 10cm square x 2mm, was only about 99p.  Haven't got round to making it yet, so the tip about the single bolt was timely.

Cheers

G

 
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I did it that way at first and got some fogging.  That's why I shimmed it out with rubber, and am OK with being able to rotate it.

 
Great tip.  I have velcro like that already.  Project for the weekend \o/.  Field testing next weekend.

 
That looks like a winner.  Actually, I've some some spare bits of 3M double sided pad from a helmet mount that would probably do a decent job.

 
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