I used a Dremel to round off the sharp edges, and reduce its length (amount of protrusion into the grip's space) by about 2mm—makes all the difference; before I shaped it, I was getting a red mark on my middle finger, quite uncomfortable. Perfect comfort now.
If anyone's interested, I have some images from the OM 50/3.5 macro on the tilt adapter on my blog; this first one shows tilt and reverse tilt images, and a brief, non-technical description:
Scheimpflug effect, with images: Olympus OM 50/3.5 lens, tilt adapter | kitlaughlin
I have another one coming tomorrow. I have taken many images while in this beautiful city, and I wish I could post them here, but I can't afford the bandwidth while on the road, so am linking to the blog—hope this is OK.
I have been on a 90-day blog challenge, so the bandwidth while travelling (using the iPhone hot spot) has taken priority over uploading to my own site, the usual method I use for here.