OzFclass

I've been having intermittent misfires with one of my Barnards.
At the range a few weeks ago it happened again. I had another bolt with me and I swapped over the firing pin and then fired 50 consecutive shots without a misfire.
Everything else with the original setup measured fine, so I've narrowed it down to the spring. I have a few spares, but no way to swap springs without ending up with bits everywhere.
A quick YouTube search found that a guy in Canada named Ian Hogg was making exactly that for $100 Canadian.
He has a YouTube video here>> https://youtu.be/1eiXW_alCYc?si=u4u-Eckvcuog5_tA
He is very easy to deal with, a few emails, a PayPal payment and it arrived in the mail today, all up around 2 weeks.
The exchange rate and freight was a bit painful, the total cost was $180AUD, but it's done.
The tool is a very solid. It is 3D printed with a stainless square-cut (Acme) thread, brass captive threaded bushing, stainless guide rod and brass washers - I'll be using it over the weekend. Works with both P and S Barnards

Ian's email address is >> 10vxaccuracy@gmail.com

Pete

T-Bone Shipwrighting have complete spring kits available
https://usedguns.com.au/gun/686495/

To disassemble, I simply use a vice, spanner and allen key along with a small torch to heat up the loctite.
To reassemble, a pair of vice grips with a bit of tape on the jaws helps to hold the spring down until you thread the nut onto the firing pin. I haven't needed any specialised tools.
Cheers, Matt.

Just to follow up.
I used the tool and it works as intended.
All done without vice grips.
I replaced the spring, it was only 3mm shorter than the new one. Now I'm thinking it was not the cause of my issue.
The grub screw that locks the cocking piece to the firing pin is supposed to be locktited in place. In this case there was no locktite it was loose and easy to turn. So the compressed spring length could have been anything.
I didn't measure the length before disassembly so I'll never know. The new one is set to the correct length and locked in place.
I purchased this action second hand and this is something I wouldn't expect to need checking.
Pete
old spring at the top

Even 3mm shorter can make a difference. The springs do get a set and will not reliably work.

PeteFox wrote: Sat Jun 07, 2025 1:08 pm Just to follow up.
I used the tool and it works as intended.
All done without vice grips.
I replaced the spring, it was only 3mm shorter than the new one. Now I'm thinking it was not the cause of my issue.
The grub screw that locks the cocking piece to the firing pin is supposed to be locktited in place. In this case there was no locktite it was loose and easy to turn. So the compressed spring length could have been anything.
I didn't measure the length before disassembly so I'll never know. The new one is set to the correct length and locked in place.
I purchased this action second hand and this is something I wouldn't expect to need checking.
Pete

springs.jpg

old spring at the top

How do yo determine that - is it related to FP protrusion?
What Loctite do you recommend?
PS I'm ordering one of these kits.

When I get home, I'll post up the Barnard publication
Pete

There is a publication by Barnard on how to change the spring.

I have scanned it and I will reply by email and attach it to anyone who emails me at pjfox11@gmail.com. It is 1mb in size. There are instructions that involve making a tool that can be used with a reloading press to compress and hold the spring to allow disassembly.

The loctite recommended by Barnard is red loctite, info in instructions

I have attached a .jpg of the measurement section of the document below
Pete