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Old 04-30-2008, 01:37 PM   #1
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Hi Standard R-101 Sentinel

Howdy All,

I have recently been given an old R-101 Sentinel and the cylinder does not rotate when the action is cycled. It appears that the hand is not engaging the ratchet on the cylinder.

After taking it apart, it appears that the hand is in good shape, but it is not under spring tension. It just flops around on the pin/crossbar of the hammer safety stop. I don't know much about the R-101 action, but this doesn't seem right--it seems like it should be under some kind of tension. Is the hand spring supposed to ride in the groove on the right side of the hand and keep it under tension somehow? Would bending the hand spring over or replacing it be a good place to start?

Thanks,
Mike
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Old 04-30-2008, 08:38 PM   #2
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Re: Hi Standard R-101 Sentinel

Here's an exploded view of the Sentinel.
Note the hand spring Part Number 18, which powers the hand.

http://www.stevespages.com/ipb-histandard-sentinel.html

For new parts, Gun Parts Corp bought most of them.
Note that there are several versions of the Sentinel, all basically the same.

http://www.e-gunparts.com/model.asp?idDept=112
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Old 05-01-2008, 07:46 AM   #3
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Re: Hi Standard R-101 Sentinel

Thank You! That schematic is MUCH better than the one I was working off of!

Am I correct in saying that the hand spring is supposed to ride in the groove on the right side of the hand? On my revolver, the exposed leg of the spring just sticks out and rides alongside the hand, but it doesn't engage it and I can't see a purpose for it fitting like that. Also, the hand just flops around loose, and I figure it's supposed to be under some kind of tension.

I know it's hard to look at a schematic and tell, without having a gun in front of you. I'll try to break the code on getting a picture posted.

Many thanks for your response!

Mike
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Old 05-01-2008, 08:40 AM   #4
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Re: Hi Standard R-101 Sentinel

Quote:
Originally Posted by Ten Driver
Am I correct in saying that the hand spring is supposed to ride in the groove on the right side of the hand?
That would be my assumption looking at the schematic.
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Old 05-01-2008, 08:58 AM   #5
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Re: Hi Standard R-101 Sentinel

Thanks Snake. I think I'm going to start by trying to reshape the current spring to engage the hand. If it goes badly, I can always get a replacement spring, thanks to dfariswheel providing me a source.

Mike
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Old 05-04-2008, 10:05 PM   #6
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Re: Hi Standard R-101 Sentinel

Hmm. Well, it didn't go so well.

I tried reshaping the hand spring, and I was able to get it to put tension on the hand, but the spring kept popping out of the groove on the hand when the hand rotated fore and aft.

I think part of the issue is that the hand floats around too much laterally. The hand has a hole at the bottom through which the hammer safety stop is inserted. This is the "axle" that the hand rides upon as it rotates forward and back. The problem is that the hand is free to move laterally on this axle, and when it floats inboard, the hand spring loses its grip on the outside of the hand and the spring pops out of the groove.

I think I need to find a way to keep the hand from moving inboard so much. I'm thinking I might experiment with a washer or spring of some type to see if that helps.

In the meantime, a new hand spring is on the way from GunParts.

I'll report back with my progress. BTW, how many bad words am I allowed to say while I'm working on this thing? I think I might have reached my limit today.

Mike
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Old 05-05-2008, 07:16 AM   #7
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Re: Hi Standard R-101 Sentinel

As many as you like...

I have never studied the revolvers but when I was at the factory researching the pistols I was told a great story about the R-100 version.

It seems that you need a slave pin to reassemble to trigger mechanism but that was not mentioned in the instructions so they made $5 a gun reassembling them for customers who just had to take them apart. They decided that, while the money was good, it was not the best PR decision so with the R-101 the slave pin was stuck in a hole in the grip.
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Old 05-05-2008, 06:02 PM   #8
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Re: Hi Standard R-101 Sentinel

No foolin? I bet the engineer who designed it that way and charged 5 bucks a shot to repair it later had a lucrative career at Heckler & Koch . . .

My new spring shipped today. I should be back in the swearing business by the end of the week.

Mike
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