special kesher in the palm made with the tefilin shel yad that I know nobody else makes.
Prof –
I’m not Ger, so I’m not sure what you mean (but I will follow up with my Gerrer friend).
As it happens, I make an additional kesher in the palm of my hand with the retzuos. Long story how I started doing so, but the clincher was what the rebbe said ” ah yid darf a extra kesher mit’n Riboinoi Shel Oilom”