Bath faucet leaks (hot water) after complete replacement of all parts. Used Kit from Lowe's. I think I might have used a wrong size spindle ! Is that possible? Also center diverter wasn't diverting water to shower head, just faucet. I added a new faucet fixture w/diverter and now water diverts but still have the leak. Please someone help.

Depends on the brand of faucet, you surely could have gotton the wrong part. Need to take the old original part in and find and EXACT match. Also, if this is a stem and gasket type faucet, you may need to replace the seat on the inside of the valve (the part the washer "seats" to.