I use Xfasten carpet tape. 2” x 20 yards, $11.97 at Amazon. It’s thin, comes off clean and very strong so you need to use very little. A roll usually lasts me a year or more.
Alan said "The sled is simply a board that is very flat while you are gluing on the stock. It can be a strip of MDF on any flat surface, such as a tablesaw or workbench. A torsion box is not needed."
If you are going to use a double-sided tape I would strongly recommend using this DS tape which I first used to attach grips to my golf clubs. I now use this exclusively for woodworking as I've found it holds very well & is easy to remove, either the typical way by separating the wood & peeling it off, but especially when spraying the edges first with Isopropyl alcohol & then peeling it off (Ref: https://www.golfworks.com/the-golfwo...p-tape/p/dftg/ ) .
Assuming you have a planer I would recommend a planer sled rather than use a router sled to joint the first side. There are a number of simple planer sled designs like in the first photo that work well and even more complex designs like the one I enjoyed making & use. Planer sleds allow one to joint/plane wider boards, up to the limit of the planer, i.e. 12"+. If interested, the plans for this sled is in the Shop Notes magazine Vol. 23 Issue 137
Last edited by Al Launier; 07-03-2019 at 10:12 AM.
Reason: Adding info
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Hot melt glue is a good way to do this also. Sometimes hot melt can be used to secure pieces from the sides like a tack welder. It can then be cut with a utility blade or released with denatured alcohol.
I use a double sided tape from Tarter Woodworking that they sell for use with their inlay templates. I have also used double sided carpet tape which is cheaper but not give as strong of a grip as the Tarter tape.