Please explain a bit more : any photos ? By « Mast Gate », do you mean the mast pivot point at the mast step to attach it to the deck? On my MW27, there is not the traditional «Tabernacle » galvanised or stainless steel cradle with 2 big bolts, but it is a perfectly safe arrangement.

I don’t have a gate and use a slide stopper to keep the slides from dropping out. See photo

However, if someone else knows of a supplier of a suitable gate that fits I would also be interested.