Rifle Mount Screws Seized - Don't DIY

andy34

Active Member
Recently changed the scope on my Sauer 202 and three of the bolts holding the top half of the mount ring seized with the allen key hole rounded out. Being an engineer I thought I could sort it and source the bolts with no problem and much cheaper than taking to to a gunsmith.

Managed to drill the bolts out but three weeks later and I still couldn't find the right M3.5 8mm cap head bolts (had to find out what they were called) with problems with screw pitch, length, size of cap head not fitting in the recess.

In the end I went to precision rifles at Ballindalloch, where £30 and 8 replacement Sako bolts later, all with a small drop oil to prevent them seizing in the future, and I'm now all sorted.

In hindsight I now realize I could have seriously knakered my mount if I'd messed up the drilling and opened out the holes. I also realize I wasted three weeks trying to find a bolt, which a good gunsmith found in his spares draw in under 10 seconds. In short I was a numpty and wasted lots of time and potentially lots of money to save a few quid on some bolts.

I therefore just wanted to post the experience in case anyone else there comes across the same issue and like me doesn't really have the right tools or spares to hand, but is thinking about having a go at fixing it. If you do, my strong advice would be to take it to a gunsmith straight away and not make the same mistake I did
 
Optics warehouse are a good source of replacement mount screws .
I did the same as yourself a few years ago with weaver mounts bolts.
They pulled my " nuts" out the fire.
 
Optics warehouse are a good source of replacement mount screws .
I did the same as yourself a few years ago with weaver mounts bolts.
They pulled my " nuts" out the fire.
Yes I've learned a valuable lesson and I was going stir crazy after three weeks. Half the problem was that I didn't know what bolts I needed as I couldn't identify the mount maker and didn't even know what the bolts were called, until my son told me.
 
I cheated ,bought 4x every size in their magic box.
Luckily my toolmaker friend is a dab hand at such repairs .
How dare he retire, inconsiderate bugga 🤣
 
useless fact, M3.5 is not a popular size in metric fasteners, the biggest use is electrical fittings screwing switches, sockets etc to the mounting boxes . M7 again little used.
 
Good post thank you though I would be very surprised if most of the SD massive had not already been there. I know my friend has - several times….
🦊🦊
 
useless fact, M3.5 is not a popular size in metric fasteners, the biggest use is electrical fittings screwing switches, sockets etc to the mounting boxes . M7 again little used.
So true - took me a wek to find what the bolts were called and then when I first measured them with calipers I assumed I'd got it slightly wrong and order some M3s - after all who use half sizes - how wrong I was :-|
 
Yes I've learned a valuable lesson and I was going stir crazy after three weeks. Half the problem was that I didn't know what bolts I needed as I couldn't identify the mount maker and didn't even know what the bolts were called, until my son told me.
And you’re an engineer? 😘
Ken.
 
I thought 35 years of engineering would stand me in good stead - until this little humbling episode
I would have thought after 35 years of engineering you would know how things like to bite you in the rear, drilling lots of holes, drill always breaks and sticks in the work with two holes to go, never the first, same with taps 😂😂
Fixing a car always one bolt that will not undo 😂
 
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