The question. I want to get a flush trim cutter the initial purpose of which is to trim the tops and backs of guitars prior to routing out the ledges for binding. I am looking at this http://www.axminster.co.uk/axcaliber-fl ... g-ax803281 UK supplier as I haven't located a local Spanish supplier. (partly a language issue).
That I need a 6.3 mm shank (1/4) is clear (see below). What I don't understand is what is better in terms of diameter of cutter. They offer 1/4, 3/8, 1/2 (6.35, 9.5, 12.7 mm) diameters and a variety of cutter depths (13mm-32mm). Cutter depth is not important to me for this job as the main is a nice clean cut.
What diameter is better in this case? I have close to zero experience with routers.
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Background. I have the UK equivalent of the Bosch Colt. Unfortunately the UK model is "crippled" by a UK unique shaft feature: it can only use 1/4 or 6mm cutters. Despite being delivered with a accessories for 8mm cutters they cannot be used. The apparently identical model sold in the rest of Europe takes the 8mm cutters.