How many Parts are there? All the time you take trying to get a plugin would be wasted. If you only have 10-20 Parts it should only take a minute or so to weld them all together. You’ll only need 10 welds for a 10 part model (9 for the parts in the model and 1 to weld it to the Handle).
Just use the Constraints tool in the Model tab. Choose Weld and select the tabletop and the item you want to weld to it. Click the weld tool again, select the tabletop and the next item.
You said you already know all the tool stuff in the tutorial, but here’s 2 things you asked questions about that are answered in that tutorial:
Just like other models, tools can be made out of multiple parts. Since players will carry tools around (or swing them wildly like a sword!), the tool’s parts should be welded together using Weld constraints.
Confirm All Parts Are Non-Anchored
When constructing tools, make sure tool parts are not anchored . If any part of the tool is anchored, players will get stuck in place when equipping it.