Copied from Schmeky's thread that is stickied on this forum.
On the left is the OEM DA roller. Notice how rough the top "flat" bearing surface is, which is where the roller runs against the steel hammer well insert. Every OEM DA roller we have seen is like this and you can see how the trigger bar was "skipping" on the roller. The roller should actually turn or roll with each DA pull. What you can't see is the bore of the OEM roller, some are extremely crude and some are good. The OEM roller simply can't be worked over to make it like it should be. Notice the CGW roller is polished and the "flat" bearing surface is actually flat and extremely smooth. What you can't see is the bore of the CGW roller, which is as good as the outside, i.e. smooth and fluid.
Sizing the correct roller is very important. Roller widths from the factory vary from .212" OD to .230" OD. This is a huge discrepancy, but is done for a reason. Different OD rollers can be used to quickly and effectively change the DA timing. We offer 2 different OD's, a .220" OD (used 85-90% of the time) and a .230" OD. If your OEM roller is .212" - .222", use our 97058-220 roller. If the OEM roller is .224" or larger, use our 97058-230.
Here is a quick lesson on how an increase in the roller affects the trigger bar timing. If you had an OEM .224" roller, and you installed the CGW .230" roller, this would "seem" to be an increase of .006". In reality, you only factor in 1/2 of the new OD, so in this case, you only increased the actual working area of the roller .003", since .006" in total additional OD only adds .003" to each side of the roller.
This is a good example of how just a few thousands can be the difference between a flawless running CZ or one with lock work timing issues.
? Last Edit: November 05, 2016, 08:13:11 AM by schmeky
