PSD Jeo,
1. The "T shaped" Bai'raagan is typically & ideally should be custom made. Ideally its used by older abhiyaasis or sadhus to sit in prolonged period of meditation with the spine straight. Younger ones should be able to straighten up their spines by themselves or automatically happens surtee is deep
2.Custom in the sense that before being made,
i) the
height of the
bai'raagan's leg needs to be of the same height with your spine's height while in samadhi position.
ii)the height of the individual's spine sitting up straight needs to be measured while sitting(with spine straight) from the bottom of one's spine and to armpit level.
3. Many abhiyaasis have got their bairaagan made from Bhai Inderjeet Singh keerpana wale(Amritsar) - with proper woodwork/ artwork design . Yes, besides shasters he makes these too, as I have seen it myself and the approach to make these was informed by Bhai Sahib jee too. You can get it made from him, InshaAllah
4. Ideally tools used in aiding Naam roopi seva of SatGuroo should be avoided from public usage/view. Not to attract any unnecessary attention or to not induce subtle houmei start affecting our sincerity in serving SatGuroo(through Naam).
Khayr.....My input is as foolish as myself. SatGuroo Jeo knows better
Chota veer