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notlwonk
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Trapdoor tumbler
May 13th, 2019 at 7:35pm
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I've seen a reference to a modified Trapdoor tumbler that has a set screw to adjust sear engagement. Are these still available or is it something a novice gunsmith can do?
  
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beltfed
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Re: Trapdoor tumbler
Reply #1 - May 14th, 2019 at 8:36am
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YOU might contact Al Fresca at
trapdoorcollectors.com
He has parts and he is an expert in TDs
beltfed/arnie
  
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Tom_Trevor assra life no.71
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Re: Trapdoor tumbler
Reply #2 - May 14th, 2019 at 11:10am
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That new made tumbler was on the market some years ago.  It allowed for adjustment of the sear engagement as well as having a lower hammer throw. It had a half cock notch and full cock for two positions. He stopped sales after it was noted the design of the half cock,safety notch to allow for the light trigger pull would with moderate pressure allow the weapon to fire from that position. I still have one here in the parts bin I will get it out and post a picture of it for you to see how it was done.
« Last Edit: May 14th, 2019 at 4:13pm by Tom_Trevor assra life no.71 »  
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CW
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Re: Trapdoor tumbler
Reply #3 - May 14th, 2019 at 7:51pm
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Is this the one Bob Smith of Powell, Wyo used to sell?
  
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Tom_Trevor assra life no.71
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Re: Trapdoor tumbler
Reply #4 - May 14th, 2019 at 7:53pm
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CW , Yes it is. Had adds in Single Shot Exchange for a while.
  
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notlwonk
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Re: Trapdoor tumbler
Reply #5 - May 17th, 2019 at 2:30pm
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Thank you for the info.
  
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boats
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Re: Trapdoor tumbler
Reply #6 - May 22nd, 2019 at 6:45am
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My experience is Trapdoor triggers are best adjusted by grinding some width off the sear spring, sear engagement and general sear geometry best left as from Springfield Arsenal. 

Reducing sear spring weight won’t make a target trigger but will give reasonable pulls. Only way I would do more is if the rifle had a full make over into a target rifle. Most Trapdoor tumbler sear alterations I have seen are failures with a tendency to AD.

Boats
  
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kootne
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Re: Trapdoor tumbler
Reply #7 - May 22nd, 2019 at 10:27am
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I did a sear modification the way described in the book "Loading cartridges for the Original .45-70 Springfield Rifle and Carbine".  It came down to about 4 lbs and I quit. It shoots much better. The sear is it's own jig using this method.
  
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sharps
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Re: Trapdoor tumbler
Reply #8 - May 22nd, 2019 at 6:05pm
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ditto with kooten, don't know what the trigger weight is on mine but there both manageable, and fun to shoot
  
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