Changed my 110's rear brake cylinders last weekend with basic tools and some patience. Bought the cylinders from a shop in Galle Road for Rs. 4,800 a pair.
Used a brick to hold the axle, a homemade flare nut wrench (cut from a ring spanner), and my Thaththa's old vice grips.
I'll post a full DIY guide if people are interested. Saved about Rs. 7,000 in labor!