Rivets for 73 Trillium Belly Band - Fiberglass RV
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Old 03-24-2018, 12:09 PM   #1
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Name: Chris
Trailer: 73 Trillium
British Columbia
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Rivets for 73 Trillium Belly Band

Hello, our 73 trillium trailer had a number of rivets pop out and I would like to drill out a number of them and replace them. Does anyone no what size rivets are used on the trillium?
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Old 03-25-2018, 11:06 AM   #2
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Trailer: 1976 Trillium 13 ft
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Hello, our 73 trillium trailer had a number of rivets pop out and I would like to drill out a number of them and replace them. Does anyone no what size rivets are used on the trillium?
I have replaced many on our Trillium, I would have to say there have been at least two different sizes and types, some were aluminum, some were steel. I have a feeling they just used whatever they grabbed that day. Get an assortment, drill them out see which size fits. I have had ones side by side being different lengths and diameter.
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Old 03-25-2018, 09:17 PM   #3
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Name: Dave W
Trailer: Trillium 4500 - 1976, 1978, 1979, 1300 - 1977, and a 1973
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It doesn't matter what they used originally. They are falling out because the metal plate they are in has rusted out. Personally I think the belly band should be eliminated:
http://www.fiberglassrv.com/forums/f...ead-59580.html

But, if you really want to keep it, I would find the largest rivets I could and drill out the metal plate and belly band to match. But this will likely lead to a drill bit through the Ensolite. On second thought, maybe don't drill it.
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Old 03-26-2018, 12:16 AM   #4
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Name: Kelly
Trailer: Trails West
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Originally Posted by ChrisH View Post
Hello, our 73 trillium trailer had a number of rivets pop out and I would like to drill out a number of them and replace them. Does anyone no what size rivets are used on the trillium?
Carefully drill the head off and then measure the diameter of the hole.

Drill bits make a very handy diameter gauge to figure out the size of a small round hole.

As to the length, that can vary depending on what the accumulated thicknesses of materials it is fastening together. You can make a little tool to check that. Take a piece of stiff wire and bend a tiny L shape into one end of it. Then poke that into the hole and pull back until the L hits the inside surface of the stack of materials. Put some masking tape or a mark of some type around the wire on the outside right against the surface. The distance between the inside of the L and the mark from the outside is the "grip length" you need. The package of pop rivets will state what the grip range for the contents is.
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