The float is drilled to accept the pivot nut at a snug fit, however variances may require the lever notch to be deepened as necessary, with a flat file or emery board. There should be no more than ~ .020" (0.5mm) compression of the foam to secure the lever. Occasionally, it is the nut that must be shortened.

Follow your motorcycle's shop service manual's instructions for assembly and settings.

Failure to offset the float in Linkert models will cause it to interfere with the bowl stem of the carburetor body, and it will overflow. Looking down into the bowl, float valve away from you, the float should be offset about 1/16" or 1.5mm to the left.

Do not grasp the float itself to bend the lever, as this will result in breakage; Remove the assembly, or use Schebler tool No. 35.

If tuning problems persist even when the carburetor is in perfect order, the manifold assembly should be pressure tested at a constant 15psi with soapy water upon it to assure that there are no leaks. If your manifold nuts are leaky, see here.

IPE has good copies of the 1928 Schebler Motorcycle Service Station Manual, which covers both model H and DLX (the tool page to the right of here is from this book). EUR30.00 (EU), EUR24.00 (World).
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Schebler factory tools.