Right hand, left eye dominant

[Rogerborg]

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.

 

[CiderPunk]

nice! I'm gonna have a go at that

cheers 

 

[MisterG]

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.

Maybe I'm just tired, but struggling to picture this, any chance you can post a pic?

Cheers

G

 

[Rogerborg]

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.

 

[MisterG]

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

Cheers

G

 

[Rogerborg]

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

 

[CiderPunk]

https://www.thepolycarbonatestore.co.uk

these guys will do a 50mm x 300mm 6mm thick polycarbonate for £1.22 I figure i can hacksaw lengths off and have some spare

unfortunately it's £9.95 shipping

 

[ImTriggerHappy]

https://www.thepolycarbonatestore.co.uk

these guys will do a 50mm x 300mm 6mm thick polycarbonate for £1.22 I figure i can hacksaw lengths off and have some spare

unfortunately it's £9.95 shipping

6mm is way to much I use 2mm most of the time and even 1mm for some. 

 

[CiderPunk]

I'll go for 4, I like the look of rogerborg's

 

[Arwen]

I simply bought "sample" squares from this guy on ebay., Works a treat. Just lightly sanded the edges to make them less sharp. 

https://www.ebay.co.uk/itm/CLEAR-POLYCARBONATE-LEXAN-MAKROLON-SHEET-UNBREAKABLE-MARLON-PALRAM-PANEL-/360813914102?var=&hash=item54022f67f6 

Edit: Picture... I used double sided foam tape to stick it to the gorpo frameView attachment 33843

 

[Rogerborg]

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.

 

[ImTriggerHappy]

I make quite a lot so machining them is the only way.

 

[CiderPunk]

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]

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.

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.

 

[MisterG]

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

 

[CiderPunk]

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.

if you keep the polycarb flush with the frame, hopefully nothing will get in that'll need cleaning...hopefully

 

[Rogerborg]

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.

 

[warlord]

Velcro FTW. Gives it the ability to flex when it takes a hit. Super sticky from Halfords. It's going nowhere.

View attachment 34027​

 

[MisterG]

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

 

[Rogerborg]

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.