Left A-arm torsion bar won't insert..., Pound more, use bigger hammer? Options

[neo914-6]

Some history, the a-arms were from Mueller assumed to be in good condition and 914 not 911. If they were 911 the splined hole should be bigger so a 914 bar will insert too loose. The stock torsion bars are from Kevin (Rhodyguy).

I realized I had the L & R bars switched so I corrected them but L bar won't insert on L arm. R bar inserts on both arms.

I pounded L bar with a small sledge hammer but it didn't insert much.

I soaked the bottom in solvent overnight, no affect.

There is no front cap (bottom pic) to remove, is this a different type?

These arms were seam welded

These arms are powdercoated and prepped for needle bearings so I don't want to find another arm if possible. New strut bushings aren't tight yet...

[914Sixer]

911 bars have one extra spline (30) whereas the 914 only has 29. Something sounds to be mix matched. You can pop off the cap on the end where the bar slots in to see what the problem is. You may have to drill a hole and pop it off with a slide hammer. You should not have to us nothin more than a hammer to give a few light taps to drive it in. Was the spline end coated by the power coater with the end caps off?