of course, I have always reserved some caution in regard to post-market modifications. Even though I have performed various modifications myself. There is the ultimate concern about the lack of measuring equipment, in order to detect the effects of a modification apart from one's idea of the sonic result.
We are all aware of the deceptions one can induce in one's own mind. I've ordered several tip replacements from Expert Stylus with complete success. But the Paratrace on the Sumiko EVO III brought an audible increase in the lower treble, which is not entirely to my liking.
Another modification which did not work out well: ruby cantilever and extreme tip from Sound Smith on my Stanton 500 EE Mk II. This introduced a slighty emphasized color on the treble, which was not to my liking.
Those are two mild misfires among several happy retips. Good average!
But that's enough to introduce concern on the discontrol over such experiments. If they meet with success, we celebrate! But if they fail, the personal budget suffers.
Oh, there is absolutley NO concern over the quality of the handiwork from off-market practicioners. Expert Stylus and Sound Smith perform absolutely exquisite operations! But that does not guarantee the audible results. Those are entirely at the risk of the owner...and it's only fair.
So, I will use the DL-103R "as is" for many weeks, and will compare with several ellipticals in my collection (including the JICO SAS M97xE and the XLM/Astrion). Perhaps my AU-300LC Denon transformer has sufficiently low resolution as to render potential improvements moot