Been using a BTH mag on my BB32A since 82.Rebuilt twice ,once in the 90s after drowning in the Irfon Crossing(remember Deryk ?)Front wheel didn't see a rock... Bent the rod also. Both mag and rod lasted the year out with regular drying out and a bit of smoke. Rebuilt again in 2014 due to I believe lack of use and stored in a damp garage. My first experience of BTH was in 67 when I started my apprenticeship/fitting working on 10 and 30 MW BTH steam turbines. Finished fitting on turbines in 93 on 500 MW units.(Not BTH)