Shop Vac to Belt Sander Adapter

I bought a belt sander from Harbor Freight Tools that came with a small dust bag collector. I thought it would be much better to have my Shopvac collect the dust rather than this bag. This is an adapter for the sander and a 33 mm diameter flexible Shopvac hose. I have uploaded the adapter as two separate parts so it can be modified for different size hoses. My ShopVac and hoses are very old, so newer models might have different hose diameters. I'm using a smaller hose and adapter to the main Sh