[quote]Would'nt welding work well?It is not necessary to be able to remove the shackles<hr></blockquote>
What would you do if you had to change the insulators or remove the bar for any type of service?
You need to cut the smallest access hole you can with a holesaw to be able to insert the retaining hardware. You should only need one hole on either side. Don't let somebody blow a hole with a hot wrench.