Tuning New spring compressor

I bought the Air Venturi rail lock compressor. Didn’t like it.
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Made a few in my wood shop with different clamps. Worked better. I talked to Mycapt65, and I now use his method with no clamps, by hand. I like the feel of it way better. Last year I did 10 spring changes by hand, including a HW80 plus spring. So far works like a charm.
I use this “nub” coated in silicone for installing.
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That piece of wood to the right of springs. Instead of using a wrench to hit and unscrew the trigger housing I use that piece of maple. No marring. Crow