I read about drilling/tapping/installing grease fittings into KLR suspension components, and a brass 1/16 NPT plug w/hole as a restrictor in the Gen 1engines. Without trying to stir the pot, I read about the cost or availability of the taps. Back in the 70s we had to drill/tap and install greas fittings in many upper “A” frame bushings on some Ford models. We did not use a 1/16 NPT tap. We used a 1/4-28 NF tap and ran the tap in 5/16” or more in. The 1/16” NPT tap is 27 TPI. The 1/4-28NF is of course 28 TPI. Over the yrs, I have used size 1/4-28 NF on cast aluminum dirt bike suspension components, steel and aluminum swing arms, AG equipment components and other equipment. I have never had a grease fitting blow out, but have messed up some grease gun couplers and hoses, especially on AG equipment after an install of fittings due to heavy grease, or close tolerances. I’m not saying it’s 100% right, but I am saying it 100%works. At least it has for me for the last 50 yrs. Just my 2cents.