Some sliding bevels have a rounded loop at the end of the beam. Where the straight edges join the rounded edge there is often a pointed edge, which can sometimes get in the way of marking out so Paul recommends filling this down slightly to avoid inaccuracy and misalignment when applying the sliding bevel to the workpiece.
Some sliding bevels have brass protective elements to resist wear and you may need to do some work on your sliding bevel to make certain these plates don’t protrude unevenly when it arrives. This usually depends on which one you buy.
If you want to read more on the sliding bevel, we recommend the following from Paul’s blog: