Was attempting to mate two 5/8 extension blocks together to make a taller riser, but realized the 5/8 tacking bolt doesn’t go all the way through the two fixtures - the balls don’t go all the way through. The description of the 5/8 tacking bolt says it can be done along with a picture showing. Should the balls go all the way through to catch like on the table?
The 5/8 tacking bolts fixture to fixture are in production.
5/8 systems are like the Wild West, every one is doing their own thing. Table thickness ranging to 1/8 -1” thick table tops. This is makes it difficult to build components that work with all the sizes. Then you have different thickness fixtures ranging from 1/4 to 1”. To many combinations for one size tacking bolt to adjust to.
@ToddReed12 I actually started this part and have drawing completed, but not in production yet
FA625-BTA162 will be the part number, expect it will be availble August
@Fireball_Jason appreciate the response. Do we get a rad discount on the new 5/8 tacking bolts fixture to fixture 
? That’s a bummer the standard length don’t do the job fixture to fixture. Since your brain works different then mine, what would be the best way to give more height past the 13" extension block, typical nut and bolt?
you are welcome to message me when they are available @ToddReed12
Great question. What table and tooling do you have? How much taller do you need to go? The obvious solution is tall tower blocks, but they are a big investment for a single project. Typically we avoid going tall on the table and try to fixture tall parts horizontal. If you have a cad model or picture of your project we can help fixture your weldment.
Table & tooling = every fireball square and every fireball fixture for 5/8 on buildpro 5/8 table. Dining room table legs, I jigged everything vertical as in how the legs and everything would be in real life. Wanted to set the cross tube between the legs at 18-20" roughly from the bottom of the tube. I thought it would have been cool to use the 13" extension block mated to another fireball fixture to make a ‘shelf’ to set the cross member on top, that’s when I realized the tack bolt cant go through two fixtures. I have enough fireball stuff to make something work, I’m sure. Would you have jigged different?
It’s not uncommon to use regular bolts and the alignment pin to combine fixture to fixture. There isn’t really a problem with access to the nut to bolt them together. The fixture to table connection is a pain to use regular bolts because it’s hard to reach under the table to get the nut started and tightened.
I would build each end flat on the fixture table. Then in an op 2, I would stand things up and insert the stretcher.
@Rambozo that’s actually exactly how I did it, flat for step one :). I just stacked/clamped fireball squares to get my height in the second step then used the alignment tabs. Came out great