Hi, some fonts neglect to specify their fontdimen 6 (I don't know whether this should be considered a bug in the respective fonts, but it's just a reality). Letterspacing these fonts does not work. This is kind of comprehensible and I'm not asking to do anything about it. However, what would be nice is if \letterspacefont could take a manually specified \fontdimen6 into account. This is for example possible with protrusion, which also doesn't work with a zero fontdimen6, but can fixed by giving a non-zero one. Here's an example (change FdSymbolB to FdSymbolA to see how it looks like with a well-behaved font): \parindent=0pt \pdfprotrudechars2 \font\x=FdSymbolB-Regular at 10pt \x \lpcode\x`b=500 bye % no protrusion \fontdimen6\x=10pt bye % protrusion fixed % here it doesn't work \letterspacefont\xy\x 300 % \fontdimen6\xy=10pt % no difference \xy bye \bye -- Robert