What's the halachic problems if any to rollerblade on shabbas? Do we compare it to biking (Kaf Hachaim assurs it)? Are there any contemporary tshuvos which discuss this? I have heard two problems if ...
In SA OC Siman 340 in the Taz Sif-Katan 1 and brought in M"B Sif-Katan 10 that one shouldn't remove wax from on top of an ois (letter) in a Sefer because of the issur of "erasing" (mechika). The Biur ...