[member=60923]s1301950[/member]
The reason I asked was that I have a saw that says it has a 2.5 inch dust port but it really is a 2.25 inch inside diameter, which incidentally is the measurement of the outside diameter of the Festool coupler that fits to the vacuum. So the vac end of my hose fits in it just fine. Your 50mm hose has one of those on each end.
any way..... try this adapter from Home Depot. It says it has a 2.5 inch end and then the next step down is 2 inches, which is the inside diameter of the Festool end. So stick it on the saw and then the FEstool end should fit snuggly over the 2 inch section. If it works cut the extra steps off and you're good.
http://www.homedepot.com/p/RIDGID-Universal-Power-Tool-Adaptor-VT1407/100206293