Pinning with O-Ring (could use Shok Buff)
I know this thread is pretty old, but it comes up high on the Google Search, so I thought I'd share my experience.
There's a great deal of discussion about the merits or demerits of pinning (or otherwise disabling) the grip safety on 1911 pistols. I'm a long time shooter, and I have found that I grip high and sometimes do not fully depress the grip safety. I know that there are some who will suggest that it is due to a poor grip, but in fact, this is quite common among 1911 shooters, even professionals. I figure it's a personal choice about disabling the safety. My other pistols only have one (or zero) safeties, and I've never had an accidental discharge.
So, I started by looking at the options. I discovered several:
1. Install a low-profile safety, which is supposed to help with this problem by better aligning the thumb so that the palm presses the grip safety. I tried this, and it DID help, but still not 100%.
2. Drill the main spring housing and grip safety and install a metal pin. I did not want to permanently modify my weapon, so I chose not to do this.
3. Use a rubber band, inner tube, or other compressive band to hold the grip safety down. I considered this, but it's a bit of an eye sore.
4. Use a piece of compressive material (and friction) to keep the grip safety compressed. I went this route. I cut a small section of automotive O-ring and inserted it between the grip safety and mainspring housing (see photos). Next, I compressed the grip safety with a stiff rubber band, and reassembled the pistol. Getting the mainspring housing back on with the O-ring in place took a little hand strength, but nothing terrible. In the end, it worked GREAT. The grip safety is now completely compressed, and I can shoot without worrying about how I grip the pistol. The automotive O-ring is quite durable, and I don't expect it to degrade or otherwise give me trouble, but if it does, I'll update this post.
A couple of photos show the idea. Sorry that they're not clearer. I hope that this post helps others who are looking for a method to disable their grip safety.