Problem with bolt hold open on 1918 DMW

Comanche1952 · 10-31-2016, 11:37 AM

It was the Sarco spring, it was too heavy. A little polishing of the spring and the HO works fine now.

Thanks to everyone for the suggestions.

Eugen · 11-01-2016, 08:23 AM

Quote:

Originally Posted by Comanche1952

It was the Sarco spring, it was too heavy. A little polishing of the spring and the HO works fine now.

Thanks to everyone for the suggestions.

The spring was "too heavy" so "a little polishing" fixed it? I need help in understanding what you did to the spring and what was corrected. Could you elaborate? By heavy do you mean too large or strong? How did you polish it, how much and with what?

kurusu · 11-01-2016, 11:06 AM

To lighten a spring by polishing can be accomplished with a Dremel tool. You just need to:

Never let the spring overheat, have a water container handy, you grind it a bit and when you feel it heating you stop and dip into the water to cool. This will prevent the spring to loose it's temper.

Also, you grind it/polish it length wise.

That's the basics. Hope some expert comes along and explains it better.

DonVoigt · 11-01-2016, 01:55 PM

Quote:

Originally Posted by Eugen

The spring was "too heavy" so "a little polishing" fixed it? I need help in understanding what you did to the spring and what was corrected. Could you elaborate? By heavy do you mean too large or strong? How did you polish it, how much and with what?

He made it "thinner" = less spring tension.

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10-31-2016, 11:37 AM	#1
Comanche1952 User Join Date: Oct 2016 Posts: 10 Thanks: 0 Thanked 8 Times in 4 Posts	It was the Sarco spring, it was too heavy. A little polishing of the spring and the HO works fine now. Thanks to everyone for the suggestions.

11-01-2016, 11:06 AM	#3
kurusu User Join Date: Sep 2007 Posts: 1,225 Thanks: 2,679 Thanked 930 Times in 509 Posts	To lighten a spring by polishing can be accomplished with a Dremel tool. You just need to: Never let the spring overheat, have a water container handy, you grind it a bit and when you feel it heating you stop and dip into the water to cool. This will prevent the spring to loose it's temper. Also, you grind it/polish it length wise. That's the basics. Hope some expert comes along and explains it better.