Thanks Phil for your suggestions. I like the look of the keyhole cutter which has a 1/4 inch shank and could be a solution. I will also canvass some shopfitters for the slatboard and see if they know what I am talking about. Do I understand you correctly when you say "face off the top" meaning to cover the slatboard with a smooth surface either side of the one t track which is to be used? I managed to purchase a 6mm perspex plate 210 x 300mm this morning for my insert, so I am making slow progress. My router is very light so I believe this will be strong enough. We also do not have a suppier for all the ready made plates that are available in UK, USA etc. The good news is, that Walmart has recently taken over our Massmart which owns a number of stores such as Builder's Warehouse, Builder's Express, Makro, Game etc so maybe we will see better choices on offer in the not too distant future.