GP 100/SP 101 mainspring assemblies

C

CZ_

New member
I just got the Wolff springs today. For some reason, I thought they sent you the whole mainspring assembly which would just pop right in. Instead, I just just got the mainsprings (springs alone), plus a couple trigger return springs. No big deal, I just can't figure out how to disasemble the factory mainspring from the mainspring assembly safely. I have the factory mainspring out of the gun--that part is easy--but how do you remove the spring from the assembly that it is on? Do I need a tool to do this, or is there some other way? I was hoping that Wolff would provide instructions, but there wasn't any installation instructions.


One other note: I'm probably going to put in the 12 lb spring. I want the gun to be reliable with all ammo, even CCI. Anyone know off hand if the 10 lb spring works ok with CCI? I know that 8 lb spring has a rep for NOT working with CCI.
 
I'm using the 10lb, not 100% reliable with CCI primers.
Place the hammer strut upside down (spring on top) in a padded vice. Using a pair of needle nosed pliers, push down on the mainspring seat until it is down far enough to remove the disassembly pin (the one you stick in there when removing the assembly from the frame) SLOWLY let the spring & seat rise until all the tenision is off the spring. Assembley is the reverse.
 
^I don't currently have a vise, so I'll have to struggle with it.

I will use the 12 lb spring, since your 10 lb spring doesn't work every time with CCI.

Thanks for the hints.
 
If you use a towel or rag, and wrap the top of the assembly just leaving enough room to get the pin out, in case it slips the rag/towel should keep the small bits from flying about.
 
This is strange, but after installing the parts the trigger feels LESS smooth than before. I did not at all like the feel after putting the trigger return spring in......it took longer for the trigger to reset. I reput the original trigger reset spring in. I don't notice a weight difference with the 12 lb spring, and in fact it feels less smooth than the 14 lb factory spring. Does it just need to break in? Or is something else wrong?
 
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To add to the last post, it almost feels like a slight grinding of metal, yet I can't see anything grinding. I double checked all the installations, and everything looks like its assembled correctly. Any ideas?

Edit: After closer inspection: The mainspring assembly is rubbing against the back part of the grip slightly. It seems like the Wolff spring slightly changed the dimensions of the assembly. Options???
 
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That is strange. You didn't perhaps get the seat piece on backwards or install the whole assembly backwards?
 
I don't think its on backwards, cause I'm using my other GP 100 as a guide (both are disasembled, and the other one has original parts in it).

My only guess is that the spring needs to go on the strut a certain way? Its very flexible (i.e. the spring moves around a lot on the strut), does that mean that it is on incorrectly? My other GP 100 spring/strut is much tighter. I guess I'm just not good at mechanical stuff. :(

Edit:

One other thing I notice. When the trigger is pulled in DA, the transfer bar rubs against the firing pin ball (before the trigger is fully pulled) as it (the transfer bar) goes up. Its almost as if the transfar bar is slightly out of alignment, as it should touch the pin until the trigger is fully pulled and held, right? It does NOT do this on my other GP 100--the transfer bar never touches the pin until full trigger pull and held trigger. I wonder if I messed something up, or if this flaw was there and I didn't notice it before.
 
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I also found the trigger feel WORSE after installing a Wolff mainspring (in my Security Six). Not only worse feel, but heavier too, though I can't be sure that the reduced-power Wolff spring I was installing was lighter than the spring that was already there, as I bought this gun used.

The trigger return spring, on the other hand, lightened the pull a bit and improved SA feel noticeably. So I'm currently using the Wolff reduced-power return spring, and whatever hammer spring was already in the gun (maybe factory, maybe not).
 
Trigger return spring

The trigger return spring is the culprit on the slow trigger reset. On my SP101 and GP 100 I had to polish the camming surface on the cylinder unlock lever to get the trigger to reset reliably. Both of mine had noticeable machining marks that were apparently causing just enough friction to prohibit consistent trigger reset.

You should not have any "grinding" or metallic feel with the new spring. You may have gotten some grit in the mechanism when you reassembled. Try cleaning and relubricating first.

The lighter spring lets you feel every undulation of the trigger and lockwork. There are several "hard" and "soft" spots in the DA trigger pull that are accentuated by the softer mainspring. Have a gunsmith do a light internal polish on all surfaces and most of the wierdness will go away.

Safe Shooting!
Brad:D
 
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