RIBTYPE / Baselock

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If your TA10 has 2 ribs (which it does) your holder needs two grooves for each row of type and usually one groove for space in between. There are 7 grooves to the inch, so depending on how many lines of text you will be using, that is how you determine the size of the holder. 2 lines should have 5 grooves to have one for space between lines. One inch will hold 3 but will not with a space between lines.  1/2" holders will hold one row of type (smalles type has two ribs)