Thanks to all for the response. Latif, look forward to seeing you again.
So you understand what I did. I use Jaco rims...which are designed for non-flanged bearings.
I use a flanged bearing which had a narrower width, therefore I can use a flanged bearing without having to ream the rim.
You can purchase these bearing on the McMaster Carr website...type in ABEC-5 bearings. I purchase non-shielded ABEC-5 bearing...they last forever and spin true. part # 57155K207
Example of bearing size:
.1562 width (includes the flanged portion)
.1094 width (bearing portion which sits in the rim)
These bearing rest flush against the JACO rim, without the need for modifications.
Now, because I used 2x flanged bearings on each rim with the e-clip axles, I do not have enough room to run an axle spacer to widen the front-end even further. A super thin shim on the inside of the axle plus the flanged bearings = just enough axle space to use the e-clip axles.
I just purchased the threaded axles from speedmerchant, which should give me some additional track width spacing.
I would recommend trying out the bearings I mention above...they are expensive, about $7.00 each but worth while. Since they have no shields they are very easy to maintain. The ABEC-5 rating is top notch...most rc kit bearings are not even rated.
Warning: if you purchase a non-flanged front axle bearing from mcmaster with the demensions I referenced above the bearing will be too narrow! For some reason McMaster does not sell a non-flanged ABEC-5 bearing in the proper width.
Hope this helps. I'll take some measurements this weekend of the over-all front track width which I run.
PS: McMaster also sell the flanged .250 x .3125 ABEC-5 bearings for the rear axle.