The manual found at
https://www.manualslib.com/manual/36...41.html#manual appears to indicate that the 241-12 is for medium to medium heavy fabric. It does not mention leather.
I also did a google search and found that it is mentioned at leatherworker several times, but the first one I read was
https://leatherworker.net/forum/topi...strial-241-12/ and I got that maybe one would not want to use it on leather.
Janey - Neat people never make the exciting discoveries I do.
Not affiliated with off-site link(s)
ETA: looks like you may have found the same post I did.