Ultrasonic thickness gauge help

[Machspeed]

Has anyone here modified the flat tip of a transducer probe so it will have a radius? Pictures? I ordered a cheap unit on eBay that has a flat tip so it doesn't work for cylinder walls which is my primary reason for buying it. I read somewhere about someone doing this but I can't find it now. I checked the unit with gauge blocks and it seems to be pretty accurate and I don't want to mess it up. The tip is stainless steel with a plastic core and a divider for the two sides. The wires are not removable so I cannot machine it in a lathe. I'm thinking about putting it in the mill or just using a grinding wheel to hand work a radius on the tip.

[fekbmax]

I'd say many of us has made that modification.  I recomend using a fine hand file, take your time and creep up on it. It dosen't take much. There should be a few post here about it and picts as well .

[thatdarncat]

Here's a link to a discussion last fall about it. A sanding block does well. I'll see if I can get my pictures on the post working again.

http://fepower.net/simplemachinesforum/index.php?topic=5449.msg58346#msg58346

[66FAIRLANE]

I laid wet & dry in the bore and rubbed the probe on that. I bought the same one as in Kevins link.

[Machspeed]

Thank you for the replies. The link shows exactly what I needed.