it can be done with the regular spring tool, but the HL tool would be better, easier and safer. I would not go over 1" on the spacers. Alum. would work the best, PVC is another option and works well for spacer material.
If you use sch 40 or 80, use a coupling with a piece of pipe glued inside it and this will double the thickness giving you a wider surface for the spring to sit on. after glue has set, cut to desired lenght. either one will work fine.
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