Jean, when using that DL103 on the Rega tonearm, you simply must try my DIY HiFi mod with the 7/16 ounce bullet shaped fishing weights on the ends of the bearing axle nuts. You can just Blu-Tack them on for testing purposes, if you want.
You'll really love the difference in dynamics and impact that it makes, when the lateral effective mass of the Rega arm gets up into the preferred mass range for the DL103. I originally designed the HiFi mod when using a DL103 and DL103R, and believe me it makes a helluva difference for the better. I think you'll flip at how much improvement a couple of well-placed weights can make.
I've had mine on my arm for over 2 years now, and at least 50 others with OL or Rega arms are using this mod, and I have NEVER had a single complaint about it. However, I have gotten many emails with over-the-top raves about how they never believed that it would make so much difference.
I strongly suggest trying it, because you are not really hearing what that cartridge can do yet. It only costs pennies to do, and is done in 2 minutes.
This is a "for real" improvement of pretty large magnitude. If you use the Blu-Tack, you can easily remove the weights if you want to use a high compliance cartridge on the arm. The lateral effective mass with the HiFi mod installed is too much for high compliance cartridges and causes mismatch, but with low compliance cartridges like a DL103, it is a match made in heaven.
See the photo of my analog rig here, with the HiFi mod installed on my OL Silver tonearm. The HiFi mod is the pair of bullet-shaped things sticking out on each side of the bearing housing.
[url]http://cgim.audiogon.com/i/vs/i/f/1039227977.jpg[/url]
Notice the DL103 mounted on the tonearm.
Let me know how you like it.