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Old 03-12-2012, 09:06 AM   #1
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Join Date: Mar 2012
Location: louisiana
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Hi-Power mainspring

I recently purchased a '67 T series Hi-Power and am in the process of tearing it completley apart and rebuilding it. I, however, was unsure how to treat the hammer strut / mainspring assembly. What is the proper procedure to remove the spring from the strut?

Thanks
 
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Old 03-12-2012, 03:01 PM   #2
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Join Date: Oct 2003
Location: Florida
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Hello,

You can't buy the Factory Mainspring separately from Browning, it comes as a Hammer Strut Assembly with Mainspring Installed, Part No. B515559702 for $13.75 and you'd need a new Strut Pin, Part No. B515559602 for $2.50 (here's the phone number for Browning's Parts Department 800-322-4626 Extension 2863).

If you go this route, which I respectfully recommend that you do, remove some of the material with a drill (a No. 2 Center Drill works great) at the "staked end" of the strut pin before driving it out of the hammer. Lay the hammer on a steel bench block when staking the new strut pin in place. I first hit the pin dead center with a prick punch, then with a short tappered 1/16" starter punch with it's tip placed on the initially punched area. It doesn't take much staking to firmly hold the .098" diameter pin in place, so use light hammer taps.

Here's a thread regarding aftermarket BHP mainsprings that you should read HP spring replacement - Handguns and Ammunition Forums
 
Old 03-12-2012, 04:01 PM   #3
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Join Date: Oct 2003
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As far as removing and reinstalling the mainspring it's self - FN has a mainspring tool just for this, but a table fork with thin tines will work.

Clamp the strut in a smooth jawed machinist vise and slip the tines of the fork between a coupla coils near the nut and compress the spring in order to not to strip the nut when you back it off the cross pin - and while keeping the spring compressed, back the nut up enough so you can remove the cross-pin and then remove the nut while keeping the spring tension under control.

To reinstall the spring (again using the fork) compress the spring enough that you can start the nut and thread it up the strut far enough to install the cross pin. Now, while keeping the spring compressed, run the nut down to the cross pin until it's just lightly snug against the pin.
 
 
Old 03-12-2012, 05:22 PM   #4
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Thank you Mr. Reed for you help. I will definatley go with Browning factory replacement. I greatly appreciate your expertise, as the Hi-Power is a newer acquisition for me.
 
Old 03-12-2012, 06:40 PM   #5
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You're very welcome and Thank You!

Just yell if you have anymore questions.
 
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